By vertical looking I'm referring to looking up and down (YZ), so left click and moving mouse up and down or scroll wheel. Otherwise there would be no way to look up based on my suggestion.
Twirl would work how it does in both normal and ground view, left click and move mouse side to side.
I'm saying that there should be a way to make it so that in normal view the compass direction you face changes in the exact same way that it does in ground view by default (+YZ). Of course only as an option not by default.