Have a look at this :
http://www.youtube.com/watch?feature=player_embedded&v=_Tb9QNHd0-w
I propose to implement the physical interaction with objects and vehicles , with their weight in mind of course , to for example , unbeach stranded boats or creating better cover for shooting. It would also enable many other possibilities
Have a look at this thread for further details : http://forums.bistudio.com/showthread.php?150589-PUSH-Push-things-around-in-Arma3-Alpha&p=2343683#post2343683