Il2 has hurricane? not FB?
mirrors are not useless in RL (still are in fighters)
but looking at part of screen used as mirror , its should be 100x100 pix? or even 200x200? its avatar size , nothing can be seen.
In RL mirrior have much bigger resolution
Even if somone like to plug in mirrors in to game, zoom and change head possition will take same time as looking back
So will be only nice add-on, not improve