Speaking only of the default Windows & OSX mouse drivers...<BR>When I use the mouse wheel to scroll in OSX (10.5) it seems to be able to detect whether I "flick" it quickly, or slowly turn it.
MyClickSpeed is a free online mouse tester tool and is easy to use. To test your mouse, first visit its website, then start clicking inside the CLICK ME box. It counts your mouse clicks and shows them ...