My first thoughts would be features like
- Making use of the permissions per usergroup
- Forcing style-x feature on usergroup-x
- Change style per time zone.
- Force style per forum-x
Just thought I'd get a discussion going after reading DRE post in wanting to force a style on usergroup-x and seeing if this is possible as an add-on and generally just get a discussion going on thoughts on the matter.
Ps. Hopefully some of you talented 3rd party devs can jump in here with your thoughts on the complexity of an add-on. I'm quite sure this is an add-on that would be paid and many users wanting to purchase.