diff --git a/src/main/java/com/NovaCraft/BookshelfPowerTransformer.java b/src/main/java/com/NovaCraft/BookshelfPowerTransformer.java
index 0573204..04654b9 100644
--- a/src/main/java/com/NovaCraft/BookshelfPowerTransformer.java
+++ b/src/main/java/com/NovaCraft/BookshelfPowerTransformer.java
@@ -26,6 +26,11 @@ public byte[] transform(String className, String transformedClassName, byte[] or
             return originalClassBytes;
         }
 
+        CoremodConfig.ensureLoaded();
+        if (!CoremodConfig.enableBookshelfPowerTransformer) {
+            return originalClassBytes;
+        }
+
         System.out.println("[NovaCraft] Patching ContainerEnchantment: " + transformedClassName);
 
         //No idea what this is doing beyond this point other than finding the correct strings in the classes above and altering them
@@ -49,7 +54,7 @@ public void visitMethodInsn(int opcode, String calledClassOwner, String calledMe
                         //Target only the call to EnchantmentHelper.calcItemStackEnchantability
                         if (calledClassOwner.equals("net/minecraft/enchantment/EnchantmentHelper") && calledMethodName.equals("calcItemStackEnchantability")) {
                             super.visitInsn(Opcodes.SWAP);
-                            super.visitInsn(Opcodes.ICONST_2);
+                            super.visitLdcInsn(Integer.valueOf(CoremodConfig.bookshelfPowerDivisor));
                             super.visitInsn(Opcodes.IDIV);
                             super.visitInsn(Opcodes.SWAP);
                         }
diff --git a/src/main/java/com/NovaCraft/CoremodConfig.java b/src/main/java/com/NovaCraft/CoremodConfig.java
new file mode 100644
index 0000000..2ea5317
--- /dev/null
+++ b/src/main/java/com/NovaCraft/CoremodConfig.java
@@ -0,0 +1,140 @@
+package com.NovaCraft;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+
+final class CoremodConfig {
+    private static final String CONFIG_DIRECTORY = "config/NovaCraft";
+    private static final String CONFIG_FILE_NAME = "NovaCraft_Base.cfg";
+
+    private static final boolean DEFAULT_ENABLE_BOOKSHELF_POWER_TRANSFORMER = true;
+    private static final int DEFAULT_BOOKSHELF_POWER_DIVISOR = 2;
+    private static final boolean DEFAULT_ENABLE_SPIDER_SPEED_TRANSFORMER = true;
+    private static final double DEFAULT_SPIDER_MOVEMENT_SPEED_MULTIPLIER = 2.0D;
+
+    static boolean enableBookshelfPowerTransformer = DEFAULT_ENABLE_BOOKSHELF_POWER_TRANSFORMER;
+    static int bookshelfPowerDivisor = DEFAULT_BOOKSHELF_POWER_DIVISOR;
+    static boolean enableSpiderSpeedTransformer = DEFAULT_ENABLE_SPIDER_SPEED_TRANSFORMER;
+    static double spiderMovementSpeedMultiplier = DEFAULT_SPIDER_MOVEMENT_SPEED_MULTIPLIER;
+
+    private static boolean loaded;
+
+    private CoremodConfig() {
+    }
+
+    static synchronized void ensureLoaded() {
+        if (!loaded) {
+            load();
+        }
+    }
+
+    private static void load() {
+        enableBookshelfPowerTransformer = DEFAULT_ENABLE_BOOKSHELF_POWER_TRANSFORMER;
+        bookshelfPowerDivisor = DEFAULT_BOOKSHELF_POWER_DIVISOR;
+        enableSpiderSpeedTransformer = DEFAULT_ENABLE_SPIDER_SPEED_TRANSFORMER;
+        spiderMovementSpeedMultiplier = DEFAULT_SPIDER_MOVEMENT_SPEED_MULTIPLIER;
+
+        File configFile = new File(CONFIG_DIRECTORY, CONFIG_FILE_NAME);
+        if (!configFile.exists()) {
+            loaded = true;
+            return;
+        }
+
+        BufferedReader reader = null;
+
+        try {
+            reader = new BufferedReader(new FileReader(configFile));
+            String line;
+
+            while ((line = reader.readLine()) != null) {
+                parseLine(line.trim());
+            }
+        } catch (IOException e) {
+            log("Failed to load ASM config from NovaCraft_Base.cfg, using defaults. " + e.getMessage());
+        } finally {
+            if (reader != null) {
+                try {
+                    reader.close();
+                } catch (IOException ignored) {
+                }
+            }
+        }
+
+        loaded = true;
+    }
+
+    private static void parseLine(String line) {
+        if (line.length() < 4 || line.startsWith("#")) {
+            return;
+        }
+
+        if (line.charAt(1) != ':') {
+            return;
+        }
+
+        int equalsIndex = line.indexOf('=');
+        if (equalsIndex <= 2) {
+            return;
+        }
+
+        String key = line.substring(2, equalsIndex).trim();
+        String rawValue = line.substring(equalsIndex + 1).trim();
+
+        if ("enableBookshelfPowerTransformer".equals(key)) {
+            enableBookshelfPowerTransformer = parseBoolean(key, rawValue, DEFAULT_ENABLE_BOOKSHELF_POWER_TRANSFORMER);
+        } else if ("bookshelfPowerDivisor".equals(key)) {
+            bookshelfPowerDivisor = parseInt(key, rawValue, DEFAULT_BOOKSHELF_POWER_DIVISOR, 1);
+        } else if ("enableSpiderSpeedTransformer".equals(key)) {
+            enableSpiderSpeedTransformer = parseBoolean(key, rawValue, DEFAULT_ENABLE_SPIDER_SPEED_TRANSFORMER);
+        } else if ("spiderMovementSpeedMultiplier".equals(key)) {
+            spiderMovementSpeedMultiplier = parseDouble(key, rawValue, DEFAULT_SPIDER_MOVEMENT_SPEED_MULTIPLIER, 0.0D);
+        }
+    }
+
+    private static boolean parseBoolean(String key, String rawValue, boolean defaultValue) {
+        if ("true".equalsIgnoreCase(rawValue) || "false".equalsIgnoreCase(rawValue)) {
+            return Boolean.parseBoolean(rawValue);
+        }
+
+        log("Invalid boolean for " + key + ": " + rawValue + ". Using default " + defaultValue + ".");
+        return defaultValue;
+    }
+
+    private static int parseInt(String key, String rawValue, int defaultValue, int minValue) {
+        try {
+            int value = Integer.parseInt(rawValue.trim());
+
+            if (value < minValue) {
+                log("Value for " + key + " must be at least " + minValue + ". Using default " + defaultValue + ".");
+                return defaultValue;
+            }
+
+            return value;
+        } catch (NumberFormatException e) {
+            log("Invalid integer for " + key + ": " + rawValue + ". Using default " + defaultValue + ".");
+            return defaultValue;
+        }
+    }
+
+    private static double parseDouble(String key, String rawValue, double defaultValue, double minValue) {
+        try {
+            double value = Double.parseDouble(rawValue.trim());
+
+            if (Double.isNaN(value) || Double.isInfinite(value) || value < minValue) {
+                log("Value for " + key + " must be a finite number greater than or equal to " + minValue + ". Using default " + defaultValue + ".");
+                return defaultValue;
+            }
+
+            return value;
+        } catch (NumberFormatException e) {
+            log("Invalid decimal for " + key + ": " + rawValue + ". Using default " + defaultValue + ".");
+            return defaultValue;
+        }
+    }
+
+    private static void log(String message) {
+        System.out.println("[NovaCraft][ASM Config] " + message);
+    }
+}
diff --git a/src/main/java/com/NovaCraft/SpiderSpeedTransformer.java b/src/main/java/com/NovaCraft/SpiderSpeedTransformer.java
index 6508e3b..56e9979 100644
--- a/src/main/java/com/NovaCraft/SpiderSpeedTransformer.java
+++ b/src/main/java/com/NovaCraft/SpiderSpeedTransformer.java
@@ -13,6 +13,11 @@ public byte[] transform(String name, String transformedName, byte[] basicClass)
         if (!transformedName.equals("net.minecraft.entity.monster.EntitySpider") && !transformedName.equals("net.minecraft.entity.monster.EntityCaveSpider"))
             return basicClass;
 
+        CoremodConfig.ensureLoaded();
+        if (!CoremodConfig.enableSpiderSpeedTransformer) {
+            return basicClass;
+        }
+
         System.out.println("[SpiderTransformer] Patching EntitySpider...");
 
         ClassNode classNode = new ClassNode();
@@ -36,7 +41,7 @@ public byte[] transform(String name, String transformedName, byte[] basicClass)
 
                             if (value == 0.800000011920929D) {
 
-                                ldc.cst = 1.600000023841858D;
+                                ldc.cst = value * CoremodConfig.spiderMovementSpeedMultiplier;
                             }
                         }
                     }
diff --git a/src/main/java/com/NovaCraft/config/Configs.java b/src/main/java/com/NovaCraft/config/Configs.java
index f1a4640..8f9f145 100644
--- a/src/main/java/com/NovaCraft/config/Configs.java
+++ b/src/main/java/com/NovaCraft/config/Configs.java
@@ -15,6 +15,10 @@ public class Configs {
     public static boolean disableEnchantedGoldenAppleRecipe;
     public static boolean enableWeaponsToAllignWithVanilla;
     public static boolean enableHalfNaturalRegenInEnd;
+    public static boolean enableBookshelfPowerTransformer;
+    public static int bookshelfPowerDivisor;
+    public static boolean enableSpiderSpeedTransformer;
+    public static double spiderMovementSpeedMultiplier;
 
     //Vanilla Ore Generation Alterations
     public static boolean disableRegularVanillaGen;
@@ -142,6 +146,20 @@ public static void loadConfigs(File configFile) {
         enableDebugMode = conf.getBoolean("enableDebugMode", "Important Options", false, "Enables log messages for location of structures generating or if a crash was prevented.");
         enableNewCaveSounds = conf.getBoolean("enableNewCaveSounds", "Important Options", true, "Enables New Cave Sounds.");
         enableHalfNaturalRegenInEnd = conf.getBoolean("enableHalfNaturalRegenInEnd", "Important Options", true, "Enables Half Natural Regeneration speed for the player while in the End.");
+
+        //Important Options
+        enableBookshelfPowerTransformer = conf.getBoolean("enableBookshelfPowerTransformer", "Important Options", true, "Enables the startup ASM patch that changes enchantment table bookshelf power.");
+        prop = conf.get("Important Options", "bookshelfPowerDivisor", 2);
+        prop.comment = "Startup ASM option. Divides the bookshelf count before enchantability is calculated. 1 = vanilla, 2 = half power.";
+        bookshelfPowerDivisor = Math.max(1, prop.getInt(2));
+        enableSpiderSpeedTransformer = conf.getBoolean("enableSpiderSpeedTransformer", "Important Options", true, "Enables the startup ASM patch that changes spider and cave spider movement speed.");
+        prop = conf.get("Important Options", "spiderMovementSpeedMultiplier", 2.0D);
+        prop.comment = "Startup ASM option. Multiplies vanilla spider movement speed. 1.0 = vanilla, 2.0 = double speed, 0.5 = half speed.";
+        spiderMovementSpeedMultiplier = prop.getDouble(2.0D);
+        if (spiderMovementSpeedMultiplier <= 0.0D || Double.isNaN(spiderMovementSpeedMultiplier) || Double.isInfinite(spiderMovementSpeedMultiplier)) {
+            spiderMovementSpeedMultiplier = 2.0D;
+        }
+
         enableStrongholdAlterations = conf.getBoolean("enableStrongholdAlterations", "Important Options", true, "Enables Stronghold Alterations.");
         enableMaxStrongholdSpawners = conf.getBoolean("enableMaxStrongholdSpawners", "Misc", false, "Enables that most rooms in the stronghold have a spawner in them.");
         enableCrackedEndPortalFrame = conf.getBoolean("enableCrackedEndPortalFrame", "Misc", true, "Enables that several end portal frames are cracked and must be repaired in the Stronghold.");