Excellent hack!
Just a couple of small problems.
First, how can I make it so they cannot ban the Admin of Supermods or Mods from a forum? I just banned myself and had to go in and change it back manually.
Second, when it sends the email, there is no name in the message body of the email. All I got was a comma where the name should be.
Is there also a way to have the words "Banned from this forum" or something like that so the Mods can know if someone has already been banned so they don't accidentally un-ban someone?
And a redirect might be nicer than opening a whole window just for the few lines to show what has been done.