to question 1: When you open carry you don't need an edge because your teeth are already showing. Open carry deters the crime before it is ever committed. Is it better to have someone try to rob you, only to have you be able to defend yourself, or is it better for that person to think that they should move onto a weaker target? IE one without a handgun?!
#2) Well, I live in Maine and I'm sure that someone from Florida will be able to answer this MUCH better than I can, but I'll look for the statutes and post them if I can find them in a timely manner.
#3 and 4 are the same as #2. If you go to www.maineopencarry.org and read WHO OPEN CARRY it will show you a whole new world that you've been missing out on for the last 20 years! :-) Happy OC'ing!