"We like the offline AI. It's realistically dumb."

[Ataros]

Quick missions can be edited, saved to Single missions and then flown from Single Missions or from FMB itself (file menu).

As for the bugs with barrel rolls and other please report them in bugtracker with a video illustration. It seems to me Luthier did not understand which issues with AI were meant because they paid attention to other AI issues recently which they were fixing. I do not think Luthier flies Quick Missions.

I think high Advanced Flying skills must be included into the game to represent exceptionally experienced aces. It is mission designers' task to set its level according to a mission. Maybe they were set incorrectly for QMB or set very high on purpose to prevent players from getting bored with AI in several months of everyday flying. If you think it is not correct, report it please.