You would also get a ejecting case to the face.

You clearly don't know how animations work. You can't simply just "mirror" a animation. They would have to redo every single animation just to get it to work of lefties so no...

Just wait for Mods, the game is set in the future and that's how its going to be so most likely no M16's until mods come out with them. Which in my opinion is good because I haven't seen moders do anything with in the future scope of arma 3 but i have seen them make modern weapons and models before

They have already explained why they do not have a 3d editor (Because the Technology is too advanced to make easily in ArmA 3 and the game would not be released on time)

Once Bohemia interactive puts fade into ArmA 3 those will go away.

Yes, I had the same problem the AH-9 and MH-9's Rotors will vanish after being shot multiple times but the Rotors are still lifting up dust and clearly creating lift for the aircraft to glide to the ground.