thanks for all the suggestions! <3 it's very helpful
definitely music & sound in particular is something I've gotten a lot of requests for so it's always interesting to hear how folks would want that to work :) for what you're interested in doing, you might want to take a look at the "bitsymuse" hack, since I think it can do basically what you're describing: https://github.com/seleb/bitsy-hacks
also, if I'm understanding the paint shortcut you described, that may already exist! try holding the "alt" key and clicking on a tile in a room and that should cause the tile to appear in the paint tool. is that what you're after?
thanks again! :)