Mostly seems like good common sense stuff. Some might quibble with #3, but the OP added the caveat that if it is a multi-bandit situation, engage at will. I agree
The low numbers in AvA must be considered. It is understandable that if there were 2 players in one area on one side and only 1 on the other team, it would suck for the singleton to to get ganged by both of them constantly. Whereas if it is something like 2v2 or greater numbers, I see no reason why it is unfair or unrealistic to engage in a more catch-as-catch can manner.
No, the only thing I can really quibble with is 4.
IMO, one of the most a-historical factor in the MA, and one that really kills my "suspension of disbelief" (aside from Mustangs crossing swords with Spitfires and the like), is that 90% of the combat is in the weeds all the time. Basically, this means that the same group of fighters optimized for low alt performance are the ones which have a tremendous advantage and are flown all the time. Performance above 15K, which is exactly what many fighters were designed for, is almost irrelevant in the MA, so they never get to really shine in there.
A 5K alt cap...wow, that is rather low even by the standards of the Eastern front. For a scenario involving, say the strategic bombing campaign and defense of the Reich in Western Europe, it is ridiculously low. I would consider it a desirable aspect of a more historical arena if one was able to regularly engage at realistic altitudes, that for instance, reveal why the P-47 was a good fighter plane.
However, I can understand people not wanting to spend 10 minutes climbing just to get to the engagement. Maybe more maps, at least for certain scenarios, should feature air-starts for both sides?
3. picking-- AVA is about 1V1. if you gonna jump in, ask first. if its a furball, all bets are off go for it
4. alt monkeys-- we try to keep things around 5k, nothing stopping you from flying higher, but if im in there ill be down on the deck. have fun with that nose bleed.