Variable Zoom button is not assignable, Hard-Coded to "F"

So another keybinding issue...  There is no entry in Key Bindings - "On Foot" mappings relating to 'variable zoom' or 'change zoom level'.  And yet in game if you press "F", it toggles the variable zoom of any scope labeled as such. 

If you look in Key Bindings - "Gunner" section, there is a function called "Switch Weapon" that is seemingly hard-coded to "F" for keyboard, "Scroll Wheel Up.." for mouse and Y button for Controller that CANNOT BE CLEARED OR CHANGED.  And in game only F seems to actually change the zoom level - not Scroll Wheel or 'Y'. 

Interestingly, this same entry (Switch Weapon) is also listed under the "Vehicle Driver" and "Pilot" sections, but you CAN successfully re-map F to something else and they work for their respective functions in vehicles.

This function needs to be remap-able on all 3 inputs for the "On Foot" section of Key Bindings and named something simple like "change zoom" or just "variable scope" and apply to any scopes that are variable (very common mouse key bind for sniper scopes).