Moderators as far as I know can ban people, although I haven't tried it, so I can't be sure.
But if the option is enable then you can ban people from the Moderator's Control Panel.
Moderators can view all the members 'secret-extra' information you just have to know how to, again this is from hte Moderators Control Panel.
Then again Admins can do anything...*scary music*
Alcar...