1: Must be on the surface to move them.
2: I've had things like no reloading of torps, or engine orders are ignored if I don't have enough crew. The more green the better. I think that when it is fully green that is it.
3: That means they can get promotions and medals.
Probably SH 4
"We have come to bring you Liberty and Equality, but don't lose your head about it. The first one of you moves without my permission will be shot." Marshal of the Empire Francois Lefebyre