Btw, about stability, there is a beta available, see ImageCode discord.

Nope, but there are source files for 2.2.1.
Anyways, I don't think you need to add there anything for that.

Is there a resource that does the inverse to this; creating populated .java files of existing .class files? I'm currently trying to create custom engines of each engine type, and getting them to appear in the catalog seems quite difficult without having access to GameRef.class to add the new parts' Ref IDs. Being able to access the other .class files could also be very helpful for the rest of my project; namely adding more clubs beyond Red Flames and improving the stability of the game.