Me and a couple of friends changed from Arma2 Dayz mod to the standalone 1,5 years ago. The game is in about 98% of its content very very much better but in one aspect it really got dumbed down. The gunplay. There are some goos threads about movement and it's great that they're about to fix the sprintleaning but the most proplematic one is in our opinion the "no sway" breathhoding (i call it weaponfocus).
It's not just super unreallistic it also leads to ridiculous behavior. You get benchrest shooting conditions just by honding a button- in every stance! The devs made the prone stance very nicely but most players never uses them. Youtube or reddit show lots of those 750m free standing shots vidoes. You can race across the map (by foot) and if you spot someone you just need about 5 seconds to regen enough stamina and you're ready. Like the other day someone was cutting a tree. I stopped - below 100m - pulled out the bottled mosin - strg and pop. Poor fella didn't got a chance and you can easily go for the head since you don't have to "wiggle" in.  And it doesn't matter which weapon. What's the point of the pioneer rifle? I mean it's an excellent choice very lightweight, light caliber, precise, optimiced for getting ready quickly up to intermediate range - a police rifle. But everyone i met ingame was dropping it for a mosin since it deals more damage.
I fear if they ever bring 12 kg Machine guns or some heavy sniper rifles (they have a bypod for a reason!) in to the game (i hope they never do) everyone will use them free standing which is very very unreallistic and bad for the weaponbalance. Everyone would go for the biggest damage since aiming is this easy and there would be no differece between a 3kg scoped scout and a 12kg scoped machine gun. The easiest fix would be if breathholding (weaponfocus) reduces sway and not eliminating it.  And making it dependable by the stance of the player. My example:
Reduce sway by breath holding
25% when standing
50% kneeling
and 80% if the player goes prone. Those are just example figures but i think you get the idea.
(and increase sway by+100% for leanshooters - it's not that steady) In the earlier woodchopper headshot example it would so far only change that i wouldn't  be so accurate and maybe searching higher ground so i could shoot prone. It still would take only 5 seconds to regen stamina for breathholding (15 seconds for the bar to fill entirely but you always can't hold breath longer than 6 seconds (ish)) That leads to second part - beeing out of breath (exausted)
Arma2 had done it very nicely - if you ran alot you would breathe heavily for quite some time and the sway was increased - not good for precise shots. I would suggest to seperate breathholding (weaponfocus) from stamina (sprinting, heavy melee) and make two bars.
Breath should only regen when stamina is full (or 3/4). And when you sprint (if you carry no weight it's about 25 seconds) breath bar drops quickly - like in 5 seconds empty. And when you jogg stamina should dropp slowly (like 1minute) to 1/4 but not further and breath should empty out in 20 seconds of jogging.
In that case you can still sprint about 5 seconds and the sprint jogg cycle would be the same as original(5sec sprint - 4 secs jogg).
Again - it's more about the idea not the exact figures.
And with this stamina bar implemented you can increase sway and heavy breathing noise within it's quarters. And back to that woodchoper example this would change alot. If i ran for very long i couldn't get a good shot right away and for breath holding (weaponfocus) I would've to wait at least 30 seconds(maybe to less?). More
chances to get spot and worse accuracy. So what do you guys think?
Thanks for reading!