BuddyPress.org

1.wpmu 2.8.4a

2.subdomain install

3.

4.from 2.6 I upgrade my wpmu regularly

5.it is

6.1.1.1

7.from 1.1.0

8.yes wp super cache

9. standard

10.nope

11. no

12.I dont know I use bp 1.1.1 and which is installed bbpress automatically by admin panel

13 its listed up there.