3. No, each player has only one movement per phase, no matter how many armies he got. You can give units to another player, to move them (best for the Marine and airforce to group up with there one lonely soldier).
But when you give units to another player he/she can't move his original units when moving yours, right? Plus, once given away the other player keeps control of the units until the end of the coup?
Many thanks for the feedback.