Great hack!
I use it at a couple board I am a part of, and recently installed it on mine.
However, is there anyway we can allow admins to change moderator/admins signatures? As admin, I can't edit my own, or other moderators. While I'm not worried about the other moderators, is there a way I can edit my own quickly like this?
Again, kudos on the great job! Thanks for suggesting it, Matt.