Some good questions. I'll take a crack at some of them (pure speculation)
1. You could use your me.com email address if you wanted, but my guess is it'll probably just sit there for most people. I have a me.com email that I've never had to use other than an account verification thing.
2. Great question that I've never thought about. Could you have two apple id's on one device? If no, could you send iMessage messages to yourself? This could be an issue for people like you (and me).
3. I would assume it's similar to FaceTime where you're given a list of your email addresses and asked to pick one for people to use. I use my gmail as a FaceTime account name.
4. I want to say that if you send to a non iMessages user it goes through the standard sms app.
I could be dead wrong on all of those. Just me guessing.
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