My current signature works but when I try to change it I get an error saying that I don't have permission to use it. Could you fix it please? Thanks.
Oh, that sucks. :/ I know that people can misuse it but why not just allow font sizes lower than the normal one? BTW I still can see the Font Size select menu in the editor, so you may want to hide it.
Being able to use smaller ones would be ideal... honestly just didn't want to put that much effort into it (it gets a lot more complicated when you are trying to do that).