It would be awesome, if you can add animations, like some of the SMK-Mod for Arma2. Loved that.
Especially the sniper-seats-stance, the dangling primary at your front, if you switch to the secondary and the Back-to-Wall movement! :)
Don't know, why someone should halter his primary gun straigt upwards over his shoulder.
Arma 3 already has many of the stances except for the wall lean, fence vault, wall vault, crouch slide, and a few other things. But those missing stances are essential for urban combat.
There are rumours that the maker of the animations works with BIS, i think you haven't played ArmA 3 at all or not enough, because the sniper sitting stance is in the game and i find "cover" useless in FPS as you can take basic cover in this game by yourself, i find, however, neccessary to have an option to jump walls
Sniper seat stance is already in, the others requests are duplicates, for example slinging the weapon in front has been requested here: #5899
Also, please only make one request per ticket.