Mouse scrolling by 'page'
USB Overdrive can do that but it's not free.



You could also add a rule like this to KeyRemap4MacBook's private.xml. The behavior when scrolling multiple ticks was a bit weird on the mouse I tested with; it only scrolled a full page about once every 0.5 seconds.

&lt;?xml version="1.0"?&gt;
&lt;root&gt;
    &lt;item&gt;
        &lt;name&gt;Test&lt;/name&gt;
        &lt;appendix/&gt;
        &lt;identifier&gt;94D0530F-70BA-4DA9-BD45-C223A689A807&lt;/identifier&gt;
        &lt;autogen&gt;--ScrollWheelToKey-- ScrollWheel::UP, KeyCode::PAGEUP&lt;/autogen&gt;
        &lt;autogen&gt;--ScrollWheelToKey-- ScrollWheel::DOWN, KeyCode::PAGEDOWN&lt;/autogen&gt;
    &lt;/item&gt;
&lt;/root&gt;


You can also increase the scrolling speed with defaults write -g NSScrollWheelMultiplier -float 200.