I kinda look for the same things, but I’m managing forum groups through BuddyPress groups :
No access to the sub-forums of Buddypress groups forums for group members
No answer in almost a year. The fact is group-based read/write permissions are a basis of serious forum management, but nobody cares in the bbP dev team…
Tweaking the template to hide the topic/reply form looks nasty as it’s only front-end. This kind of permissions should be built-in CMS-side.
