Don't ask me how (I always find a way to do stuff like this), but I managed to delete the keymaster for my forum. :-)
Since my forum is "live" and I don't want to lose posts, re-installing isn't really an option for me. Is there some way I can modify the database directly to grant keymaster permissions to an existing user?
In bb_usermeta, I found a column with data like this: a:1:{s:6:"member";b:1;} that I think might be the key to doing what I want, but changing the word "member" to "keymaster" doesn't seem to do the trick. What should I do?