A couple of suggestions (I'm still on the fence about IonCube... hehe).
The ability to add/remove a usergroup from someone after the fill out a form. I've got some open registrations I'd like people to fill out a quick questionaire and then once done (regardless of their answers), change their usergroups.
I think this idea is a little too complex, but... I'd like to have it so I can set specific usergroups to be able to create forms. But I'd like it so they can ONLY edit their own forms and such things like posting to a forum/thread only show what they have permissions to see normally. This would allow me to offload some things on to other people, without having to give them admin access or otherwise access to all forms.
Anyway, just some ideas. =)