1. Doubt it
2. Well.. yes. Script files, database, config, etc., it's all just a matter of sending it, I guess.
3. I don't see the point, although I guess it would be theoretically possible. You'd probably be better off with Fraps or another screen recording program, though.
4. What? SA-MP doesn't have new skins as far as I know? In MTA, you can replace textures like it's been done in the zombie gamemode (Slothman's)
5. Yes. If you can script that behavior.