That is, without changing my mouse wheel's scroll direction?
The two are off, IMO. I prefer the MacOsX approach, but anything that makes them consistent would be better than what I have now.
This question: Reverse two finger scroll direction (natural scrolling)? seems to address a similar concern but the solutions all appear to reverse the directions globally, that is, for all pointer devices, rather than on a per pointer device basis.
How do I set this on a per pointer device basis?