[kh99]

Make sure all your admins and moderators have strong passwords and you probably don't need to worry. If they're trying common passwords across all users then there's probably nothing you can do unless you want to force all users to have strong passwords (I think there's a mod for that), but at least they won't find an admin password.

Edit: I was thinking you might be able to add a delay after an incorrect password, but I'm not sure if that would tie up server connections. Another idea I had was to redirect to the home page on an incorrect password, so that maybe their program would get confused. Either way I think you might need to modify vb files. (BTW, I don't know for sure that would work, these are just a couple ideas I had).