oh sorry guys i totally forgot, heres the multi rank control panel (im sure someone could improve on this, it was just... thrown together as quickly as possible) ill post the hack in a few hours, just need to extract the changes from the code. while you wait, youll be able to see how the hack works from the admin script though.
NOTE: you will also need to add the hack for the selection box in the users profile to get this to work, otherwise users will get a box where theyll have to type the rank name in manually (guess) which isn't great, ill bundle that hack in the same zip