Since I'm playing Animal Crossing: Wild World regularly at the moment, it could be fun to try and make a homebrew program that does a little bit of save editing for some things that aren't necessarily cheats, but that just make the game nicer to play? That kind of area feels under-explored.
It'd be nice to have some expanded item storage (with a "sort" button), and a tool for making it easier to decorate the ground with patterns (and help with patterns in general). Maybe the ability to move rocks and trees around? And it could help with keeping backups.
