Since you are only crushed by AA and KK, flipin againts rest, dominating all Ax Kx... sure! Sometimes you just need to win flip, or suck out on better hand ;p
Hmmm. It's situational and purely dependant on the opponent. I'd say at 2NL ZOOM in general - No.
It's not often you see QQ all in preflop from my experience. I'm certainly not 5betting with AK. But if I'm 3bet then I might 4bet if I'm OOP.
Don't worry at all about having just AA,KK in your 5betting range because it is 2NL ZOOM. Your opponents are not going to have anywhere near enough hands on you and the majority of them don't even have huds and they aren't taking notes either.