I just attached an external windows mouse to my mac and I inverted the scrolling. But now it also inverts it for the touchpad... Is there a way to invert it only for the external mouse? I really don't want to switch it up every time...
I've had a simular issue as an inverted (external) mouse is pretty... annoying. If you never use another computer, you will get used to it eventually.
But if you would like to customize buttons, I would recommend you steermouse as per their site:
SteerMouse is a mouse driver that lets you freely customize buttons, wheels and cursor speed. Both USB and Bluetooth mice are supported, no matter whether the mouse is designed for Windows or Mac.
This is Apple redefining normal. For me it is fine on a trackpad but counter intuitive with a scroll wheel. It started on O/S X Lion and I have been using a little utility called Scroll Reverser to change the behavior: