diff --git a/index.js b/index.js
index b3537d5..9819ab1 100644
--- a/index.js
+++ b/index.js
@@ -4,7 +4,7 @@ const transports = require('./transports');
 function rawr({ transport, timeout = 0, handlers = {}, methods, idGenerator }) {
   let callId = 0;
   // eslint-disable-next-line no-param-reassign
-  methods = methods || handlers; // backwards compat
+  methods = methods || handlers || {}; // backwards compat
   const pendingCalls = {};
   const methodHandlers = {};
   const notificationEvents = new EventEmitter();
@@ -111,6 +111,8 @@ function rawr({ transport, timeout = 0, handlers = {}, methods, idGenerator }) {
           const testArg = args.pop();
           if (testArg && typeof testArg === 'object' && !Array.isArray(testArg)) {
             config = testArg;
+          } else {
+            args.push(testArg);
           }
         }
         return sendMessage(name, args, config || {});
@@ -132,6 +134,28 @@ function rawr({ transport, timeout = 0, handlers = {}, methods, idGenerator }) {
     }
   });
 
+  const configurableNotifiersProxy = new Proxy({}, {
+    get: (target, name) => {
+      return (...args) => {
+        let config;
+        if (args.length) {
+          const testArg = args.pop();
+          if (testArg && typeof testArg === 'object' && !Array.isArray(testArg)) {
+            config = testArg;
+          } else {
+            args.push(testArg);
+          }
+        }
+        const msg = {
+          jsonrpc: '2.0',
+          method: name,
+          params: args
+        };
+        transport.send(msg, config || {});
+      };
+    }
+  });
+
   const notifications = new Proxy({}, {
     get: (target, name) => {
       return (callback) => {
@@ -148,6 +172,7 @@ function rawr({ transport, timeout = 0, handlers = {}, methods, idGenerator }) {
     addHandler,
     notifications,
     notifiers,
+    notifiersExt: configurableNotifiersProxy,
     transport,
   };
 }
diff --git a/test/index.js b/test/index.js
index 8edfb39..1c3e01f 100644
--- a/test/index.js
+++ b/test/index.js
@@ -12,14 +12,20 @@ function mockTransports() {
   a.on('message', (msg) => {
     a.emit('rpc', msg);
   });
-  a.send = (msg) => {
+  a.send = (msg, config) => {
     b.emit('message', msg);
+    if (config) {
+      b.emit('config', config);
+    }
   };
 
   b.on('message', (msg) => {
     b.emit('rpc', msg);
   });
-  b.send = (msg) => {
+  b.send = (msg, config) => {
+    if (config) {
+      a.emit('config', config);
+    }
     a.emit('message', msg);
   };
 
@@ -139,6 +145,46 @@ describe('rawr', () => {
     clientB.notifiers.doSomething('testing_notification');
   });
 
+  it('client should have notifiersExt method', () => {
+    const { a } = mockTransports();
+    const client = rawr({ transport: a });
+    client.should.have.property('notifiersExt');
+    (typeof client.notifiersExt).should.equal('object');
+  });
+
+  it('client should be able to send a notification with notifiersExt', (done) => {
+    const { a, b } = mockTransports();
+    const clientA = rawr({ transport: a });
+    const clientB = rawr({ transport: b });
+
+    clientA.notifications.ondoSomething((someData) => {
+      someData.should.equal('testing_notification_ext');
+      done();
+    });
+
+    clientB.notifiersExt.doSomething('testing_notification_ext');
+  });
+
+  it('client should pass config to transport when using notifiersExt', (done) => {
+    const { a, b } = mockTransports();
+    const clientA = rawr({ transport: a });
+    const clientB = rawr({ transport: b });
+
+    let receivedConfig = false;
+    a.on('config', (config) => {
+      config.should.deep.equal({ postMessageOptions: { transfer: ['test'] } });
+      receivedConfig = true;
+    });
+
+    clientA.notifications.ondoConfigTest((someData) => {
+      someData.should.equal('config_test');
+      receivedConfig.should.equal(true);
+      done();
+    });
+
+    clientB.notifiersExt.doConfigTest('config_test', { postMessageOptions: { transfer: ['test'] } });
+  });
+
   it('client should fail on a configured timeout', async () => {
     const { a, b } = mockTransports();
     const clientA = rawr({ transport: a, handlers: { slowFunction, hi } });