Perhaps a randomizer for pilot wounds, similar to what we apparently have for oil/fuel hits. To simulate a hit in the limbs or extremities, maybe slower control response, delays in flap/gear/engine settings (whatever things would have normally required the use of one's hands to operate/engage), etc. Surely not all pilot wounds would have resulted in perpetual blacking out, nor fatalities; surely an injury from a light MG would be less severe than one from a heavy cannon.
Not my idea, but one I felt had enough merit to warrant it's own post.