I dislike K/H in attack mode. See no reason for it considering people are flying heavy jabos that take time to get to a base.
Also, I do wish the scoring took into consideration ENY or something like you said where it encourages players to fly in harder slower planes.
I never understood the fly in at 500 mph, extend for ever, then come back and try again. Being aggressive in many instances will get you the kill rather than extending for miles.