I know I'm a bit late to this party, but I have a request if you're still accepting them.
I'm a big fan of Activision's Space Shuttle, and I can live with the graphical glitches, but the way it uses the color/mono switch makes it awkward to play on the portable since you have to hold the button down to keep it in Mono mode. The game is already designed to use the left difficulty switch for the same functions, but only if the color/mono switch is in mono mode.
An effective fix would be to hardcode any check to the color/mono switch to zero. Distella won't disassemble an 8k ROM, and I don't know enough about disassemblers in general to attempt this myself. Does this sound feasible at all?