I dont like the word realism in a game of “human blocks” and zombies but have a irritant factor in unturned 3.0 is the totaly lack of acceleration because this i go propose things just to place this in topic.
+Add fisic in the game.
-This go affect all physic objects (Bullets, Vehicles, You Char)
In 3.x even if you jump from a building the player model still standing so i hope in 4.x player should at least lay down on the ground (falling animation) because of its impact? Will look more realistic