[Feature Request]: AC Contra rolling mine fix

[Firehawke]

Feature Summary:

It appears that parts of the Contra Anniversary Collection are based on old MAME code. An old, fixed bug in MAME is present in Contra (Arcade) -- the rolling mines in the 3D stages roll to the right side. If possible, see if this could be patched.

Is your proposal related to a problem?

Rolling mines should roll straight and not curve towards the right side of the screen.

Describe the solution you'd like

Here's the MAME fix from a long time ago, which involves a missing multiplier/divider function: mamedev/mame@c1bf2b9

This might be extremely difficult to implement, but it would greatly improve the quality of the emulation if we could get this one major issue fixed.

Describe alternatives you've considered

The only other real fix would be to use a different emulator, such as MAME or FBNeo.

[Firehawke]

Just wanted to comment in passing this one feels extremely unlikely to happen, but it's there if someone wants the challenge. It's pretty clear Konami has stopped support (okay, maybe barely ever had support) for this title so it's not something that'll ever get an official fix.