Just a spitball, but maybe before the new game comes out, the AH team or whoever could look into the possibility of making gunsights get damaged in the game, but only applies to planes that carry secondary gunsights(i.e. the p40c, p40e, p47d11, d25, basically any plane with a secondary means of homing in on the target).
But there should be a certain way as to how it gets damaged. If a certain pilot manages to hit the cockpit well enough(say some MG's or a 20mm cannon shot), or at a certain angle of attack, the main pipper would be rendered inoperable, but the pilot will still be able to use its secondary sights for targeting their enemy.
It doesn't mean that you have to be PW'ed in order to ensure the hits, but like I said, only at an angle, or well-placed hits will do the trick. This will only apply to planes with secondary means of targeting your opponent.
Also, it would be cool for planes with adjustable gunsights, such as the A6M's, I-16, Ki-43(I think), etc. to be put to good use in case the main pipper goes out of action, too.