Maybe simple idea: Fix the controls for Bart vs The Space Mutants. 

It could be done like Riivolution for the Wii. The translation's stored on the memory stick, and it patches the game in real time.

And Nintendo hasn't yet blocked it in a firmware update?
(not to say I don't like being able to play a translation with a legal copy of the game)

Extra Mario Bros 2 

An idea I've had for a long time, but can't seem to ever getting around to doing (time, skill, what have you) is to hack General Chaos in order to make its soldiers appear as 16-bit versions of Team Fortress 2 characters (where possible). This is basically for personal reasons, since I consider that title a kind of spiritual predecessor to Valve's game (the link would be much more noticeable had Valve gone ahead with their idea of adding a general system in the game, as they had once planned).

But I'm not even sure if all of GC's characters are editable that way, so, yeah, that's it for me.

i think my game megaman odyssey might be what you said maybe.
It's something i never originally ever intended to do in the first place.
But the 8 robot master guys would all be made of 2 seperate levels.

And they have their own seperate level names too. If you ever heard of odyssey or tried the demo before, then you'll already know what i mean. Duplex and Bolt had 2 seperate levels, and their own level names you'd see on: Stage Select, Time Attack select, and Pause menu screen.

There's tons of rom hacks including mine, that do exactly that. About select button. only able to go in 1 direction though, not both unfortanetely.

But there is 1 or 2 hacks out there that attempted to program Left AND right...but it's very very un-comfortable and in-convientient. Something like holding the select button, then press left/right D-pad to scroll through weapons.

I just think that sucks because it interupts gameplay....because you gotta come to a dead stop just to do it...it's just not worth the time.

Original poster's note: This post and the post that immediately follow were moved to this topic by my request.  Sorry for the confusion!

Greetings!  I have a rather odd question/request...

Is it at all possible to hack Mega Man & Bass for the Game Boy Advance to allow players to push a single button to make Bass dash?  The game is most definitely a fine addition to the classic series and this port is, in my opinion, nearly flawless save for this one stupid oversight.  I'd love to be able to do this as I'm pretty much dependent on there being a button dedicated to dashing, as there was in Rockman & Forte on the Super Famicom.  Fighting Astroman using the buster alone becomes impossible for a fumble-fingers like me if I keep having to press left or right twice in succession to get out of the way.  I'd prefer to be able to press R to quickly zip out of harm's way and keep fighting, even at the expense of being unable to fast-switch weaponry. (Of course, that button could easily be plunked on to the Select button, if I desperately need to scroll either way through weaponry...)

Anyway, here's to hoping this is something that can be fixed!  Thanks for reading!