So, get the computer back with two shiny new fans installed and decide now is as good a time as any to do a clean install and move to OS X.7 Lion. Get it in, goto play WoW and... wait a second.... why am I zooming in when I should be zooming out. Hmm... I can flop mouse up for mouse down in Keybinds and that fixes it but why is it doing this in the first place?
This is why:
"Move Content in..." + "Scroll Direction Natural" are linked; the later is what makes the page scroll down when you use the two finger up on the Trackpad and up when you two finger down. Unfortunately, because they're linked this also makes the mouse scroll wheel behave the same way and you can't set them individually so you can have them act in ways you're used to. It would be really nice if that were not the case because the wheel on the mouse is conceptually different in use from the trackpad and it's behaviour should not be tied to that device; especially when the settings are individual on the control panel.