Give me gun jams, night, cowl flaps, mixture, boost, turbo overspeed, engine overheat and shell, cumulative pilot fatigue, oil spray on the window, blood, guts, gore, and veins in my teeth! I want a ground crewman to have to wipe the blood off my windscreen!

Seriously though, there are a number of things that come with realism. The more realistic, the more some aircraft will hated for being "uber" and others shunned for sucking. Frequently, what made the difference for a country or squad flying a piss-poor plane was numbers and numbers is something that isn't commanded in AH. People fly what they want to fly and what they can kill and survive in best. So with more realism I think there will be more planes left out and/or more reliance on the perk points to get people into flying gas cans.
But realism is the whole thing for me. Any poll you guys want to run, if it is a feature that brings more realism to the sim - regardless of it being more pilot workload or having to actually know a little about how these things should be managed, count me in as a YES vote.
Real crews - not just a lone gunner too - anything.
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Rape, pillage, then burn...