Something that has always bugged me is that there are no real hacks of Battletoads out there. The most I've seen is a tiny mod, and a bug fix.
Battletoads is easily my favourite NES game, and possibly my favourite game of all time. I just wish that someone would be able to create some sort of level editor for the game, so I could experience that fun all over again, possibly with harder and longer stages. A lot of care should be put into it. If such a thing could see the light of day, that would be the most amazing thing in the world!
Any programmers out there reading this? I'm hoping that one of you could take a look at the assembly code of Battletoads, and find some way of working with it. I'll support you in any way I can!