Re: Mass user delete
If you are integrated with wordpress, I believe you can mass edit users on that side (either natively or via plugin). With 1.0 using backpress, they will hopefully port over some of the user functions into the admin panel – ie. create new user and mass edit.
Keep in mind bbPress (and I don’t even thing WordPress) actually deletes users entirely from the db, it just disables them.
If you find a WP plugin that does what you want, it should be fairly straightforward to port to bbPress.