50
A few things that would be really nice as part of the core would be:
* Group weighting - to determine priority of privilages
* Different landing pages per group
* Different themes per group
* Remember last accessed theme as default
The first of the above would help sort out what would be applicable or if that could get really messy, limit these features to members who only belong to s single group.
This would, for example, provide a different landing page for guests and registered users, but especially webmasters...
Themes could then support the layout and access of functionality. For example, in one site I have, all menu blocks are not visible to registered users, specialist groups have access to the Theme block which then enables them to unlock the menu's by switching themes.
Cheers,
GadgetMn