Could you add button to quick change FOV between 2 or 3 values. Sometimes it’s nice to have 90-100 and sometimes you need 60. Changing in settings is problematic when you fight 
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You can do it by pressing Shift while aiming

So you could turn any iron sight into a 5x Zoom scope in a click of a button?
Yes, will will finally have quality of view like in real live.