found this plugin: http://wordpress.org/extend/plugins/bbpress-admin/ which offers exactly that: administer your bbpress from inside the wpmu admin, but unfortunately its old and no longer working.
Anyone able and up to fixing that plugin?
Sounds like a brilliant plugin to me.
I'd even donate a small amount, maybe we can make this a communual effort? Anyone else interested? I know I should probably post this in the job section, btu wanted to get some feedback first.