Got a new Mac yesterday that came with the original Apple Pro Mouse. I'm used to using the scroll ball on the Mighty Mouse to scroll, but of course the Apple Pro Mouse does not have this. But the keyboard and Apple Pro Mouse, original to this Mac are the awesomeness I remember using way back in 2001/2002 at work. So, I did a little light Google digging to find some options to scroll with the mouse. ClickScroll is what I found. Set it the way you want, modifier keys plus a mouse click, or just a keyboard shortcut and any movement of the mouse becomes scrolling until you use the same shortcut again! This is great for me because I browse the web in TenFourFox in full screen with no scrollbars. You can even invert the scrolling direction, which I have done!