Fists: left click to push, right click to pull/drag
Sometimes, your teammates falls just short of a safe cover right next to you.
It would be great to have an opportunity to promptly save him.
Another possible usage is to help teammates get just enough height to make otherwise impossible jump if you happen to be above them.
Or drag your enemy behind the door to close it and finish them off without leaving a body out in the open.
it would open up so many possibilities