1. I'd say MC or DMC. Would fit better on DMC when you play with long passes.
2. Any player that is positioned on the flanks (which of course makes it most suitable to play with passes down both flanks) or an AMC. It can be extremely powerful when a high-quality AML/AMR has it. Last season I bought an AMR/MR with Dribbler SA and he scored ~20 goals in 10 matches.
3. Doesn't matter, it's just a dumb line of text put in a player's profile.
4. Yes, see A1.
5. Depends on your style of play, don't expect your MCs to be MOM if you don't play through the middle. I usually play through the flanks, so I'd prefer my MCs to have Free-kick/Corner specialist SA in order for them to be more useful.