I'd pay ($50) for an add-on that offered a "hardcore mode" where the AI would actually turn and fly their planes to the limit of the aircraft and where they didn't fatigue from the fight quite so fast.

In other words, if you were flying against an AI DR1, you wouldn't be able to out turn him if he was an Ace and you were in anything but maybe a Camel. I believe either Winder or Pol stated that the AI pilots don't currently fly their aircraft to the limit of their abilities, so this would definitely make fights quite brutal.

Maybe the pilot Fatigue would be a multiple of the AI skill level, so Novice AI pilots would Fatigue from a fight at the current rate, Veterans would take 1.5 times longer to Fatigue than the Novices and Aces would take 2X as long to Fatigue as Novice AI pilots.