Here is the video that perfectly explains what I meant, made by MulleDK19 in Unreal Engine 4
http://youtu.be/2B4otNhy2uM?list=UUYSYP12tB03sBI4Pf_sL2LQ
The door presented in the video is physical, the hand also snaps to the handle (in current situation, automatically, but in the game would be nice via some interaction button or clunky actions menu)
Also, check that ticket http://feedback.arma3.com/view.php?id=20115
Same thing would be very nice to have in all vehicles in future, would be far better than animating them.