What are talking about? Staying Airborne? It wouldn't be that difficult. With constant speed props and automated systems most would fly like they do now.
The LW planes in AH would all have automated single lever functions. Most other planes you would just set rpm and throttle. HT already models rpm.
The other things like mixture and supercharger are just button clicks and add nothing and could remain auto.
The biggest difference would be as Kweassa describes it.
110% throttle would be emergency / takeoff
100% climb combat
Then planes with extra boost system like adi, MW50 and C3 injection would have the added "WEP" key.
Then by establishing an engine overheat model HT can set the time limits on each power setting.
It’s not hard in FB (even with its flaws). Go to Zeno's and watch any of the various training films to see its not that complicated.
http://www.zenoswarbirdvideos.com/As I said I am not sure how much of this would enhance game play for the average player in relation to the amount of work on HT's end. That is up to HT to decide.