In Unturned 3.x when your running you lose stamina which gives it’s disadvantage. After running when you ADS with a weapon your stamina loss has no effect. It’s very easy to shoot weapons after running, and jumping around.
Suggestions For 4.x
I think that in Unturned 4.x there should be much more of an effect when shooting a gun after losing stamina. Arma 3 has this system where after your running for a long time it takes a toll on your aim when shooting. I think Unturned 4.x should add this to stop players from running, jumping and then being able to shoot with no problem.
I think this is good but it should be able to configure for servers/singleplayer so it wont end up as horrible as ArmA3s weight and stamina system (can only run 10 meters with AT kit before running out of breath)