Thank you! I think I need to pull out a proper normal mouse and try that out. Sorry about the inversion.
I'm suspecting that my third person camera has a ways to go; I might try using an interpolated camera or something like that on it instead. Easier on the eyes. Maybe throw a pause menu with an invert-mouse option, on both axes, just to be safe.
Crazy how many different "mice" types we have these days.