Don't know if it's been suggested already (there are a lot of posts here), but you know what would be interesting?
1.) The ability to create predefined paths/actions for characters in the mode so they aren't statically just sitting there without intervention (maybe on a timer or something instead of constant).
2.) Assign text dialogue to certain characters and options/responses for them (with a system that tells you when they are being talked to and what responses are given).
3.) I don't know if you can already, since you've made it have so much freedom to begin with, the ability to add your own audio files for music and sounds.
