It wouldn't be adding new controls to the system as it is now, it'd work exactly the same. It's just when you or another player looks down their sights, the character model that represents them would take on a stance or pose to represent that you are looking down your sights. The way it is now, it's just the perspective of the player who aims down the sights that gets changed. Raising and aiming have the exact same animation which is a little weird. If you think about it, it's like the character's eyes kind of just gravitate out of their head and go down to look at the sights of the weapon. I mean stance as a general term, I don't mean to reference the stance system in Arma 3, as much as I love that system.