1) Technically, yes... if you were heavily sedated, and didn't need to eat.
2) If you set your mind to it.
3) Yes.
4) In most of my lucid dreams this is exactly what I do. I explore, to see what I can find. Everything is a clue to my subconscious. I open doors. I open drawers. I look under things. One time I demanded to speak with my subconscious, and when I turned around, there he was.
5) It depends on who you ask. I, personally, do not believe in a deity that would care about such trivial matters.
6) No // No
7) Technically, yes. You can cause a person's brain to do anything it is capable of doing, if you are really good.