There should be a option at the admin site, to select standard forum view,or buddypress groups view.
For many people I think the bbpress integration into wordpress (make bbpress look the same as wp) is just to heave. So they jump to some other forum software.
In the and most of them are missing forum community features.
In the moment you have to rewrite bbpress plugins to use them in the puddypress bbpress installation. Or have two install with two admin sites.