[Plugin: Yet Another Multi-Site Manager] using multi-site manager with buddypress

I don’t quite understand what your query is about. Regarding this plugin’s compatibility with BuddyPress, I haven’t actually tested it with BuddyPress so I don’t know if it will work.

EDIT: Chances are this plugin will not work with BuddyPress because I use a custom registration page and disable the default WordPress registration page. BuddyPress does the same thing so I doubt the two will work together.