The same “problem” that the EE Member Module has, exists with the User Module as well.
If the User Module was to have such functionality, I’d imagine it’d be a big undertaking.
As Robin suggested, Member Groups is the only real way to go about this.
I’ll note this as a feature request though, and let Mitchell judge this one
The challenge is that a member might be part of a group relating to their level of permissions for making changes to entries.
Then, in addition, they might have access to 5-10 different forum boards.
I can’t imagine how the member groups would allow that. Perhaps you can point me to a place where this has been discussed already.
I’m sorry to say it, but then you’re out of luck
What I was suggesting was having different member groups per “group”. You can then assign member groups to access of certain forums.
But as for overlapping, etc, then you’re out of luck…