Here are my suggestions for it...
1.Have players vault over little fences/walls.
2.Jumping will wear your stamina out at least 25%.
3.Jumping sounds of feet. Or maybe like the CoD Black Ops vault/jump sound.
4.Walking sounds.
5.Running/Sprinting wears your stamina out 10% every 10 Seconds you are sprinting.
6.For JVS content like doors, you see your Blocklanders hand actually turn the handle and open the door.
7.Punching is realistic, you can block, dodge, and of course punch. (If you get hit near the face/nose you start bleeding.
8.Falling Bricks can hurt/kill you.
9.Bullet Damage is at 45%, A sniper head shot is 100% Sniper Body 85% Sniper FEET 65%.
10.Have realistic Emotes.
This would be the most impossible thing of all time but Just a suggestion.