Awesome job Bart, all that effort has been worth it
Feature request:
If racing game, and mouse enabled, allow mouse to act as the driving wheel, for sole useful purpose to allow for accurate race course selection. A left / right sensitivity setting would also be most useful too (if that is even do-able).
e.g. supermodel roms/scud.zip -mouse_sensitivity 50
NOTE: i did read your not accepting user requests at this time, but i feel this feature alone would make a huge difference to racing game selection screens.