is it possible?

like, putting a lightsaber handle (is it called that?) in a belt, or anchor (?) a rifle to the back of a soldier, so its not going through his stomach or shoulder?

No.

What do you mean by "rotate?"

If you mean an addon that changes position in-game, I think that's impossible. If you want something not too complex, like a fan or something, I think you might be able to create an addon mesh with a scrolling texture.