When you play with a friend in MP the player who does not command group cannot select MG in a tank for example, if both players are in the same tank, when the group leader drives and the other player is in the gunner seat. The toggle weapons does not work for the subordinate player as gunner. He cannot switch to MG. If the roles are reversed there is no problem. This is problematic as sometimes I like to switch places with my friend without changing the command chain.