I am at work at the moment, and I pray to all the various gods of invertness that this will indeed be patched very very soon. I need my inverted mouse.
Geralt is not an aeroplane. I know this is an incredibly unhelpful response, but why do people use inverted controls in non-flight sims anyway? It's just a bad habit to get into that can backfire, as in this case.
It was the norm back in the day, I have played all manner of games with inverted mouse since before I even was a teenager. This may have been the standard at home because of my older brother but I believe Quake and the likes had it as default.
At any rate, old habbits die hard.