I've never likes to aim down sights with a high magnification scopes. Mainly because it's too damn clunky when moving and it has no smooth movements.
Now what I'd like to see in Arma 3 is to be able to see things outside of my scope when aiming down sights, like in Red Orchestra 2. Nothing else is magnified except my view in the scope and the ability to freelook around using your default freelook button.
Sorry if you're kind of confused, that's because I couldn't find the exact words to describe my situation.