First of all - love the app!
Second, I'd love it even more if you'd add support for the following:
1. Add a smart group for apps not in any other groups. That would make it a lot easier to sort things.
2. Add support for more icons in each folder of the launcher. We all have hobbies and interests, and with those we are more or less bound to have more apps supporting those hobbies/interests than will fit in the default folders.
3. Make it easier to save settings from a theme, to either re-apply if going back to the theme or to import parts from into a new theme. For me, an ideal candidate would be an "app page" with my favorites easily accessible. This page, actually, is the main reason (along with all the pain of reverting with all my settings if I want out) I don't try out more themes.