OS X Mountain Lion: Change the way your mouse works
To work more comfortably, you can change the way your mouse responds as you move it.
- Choose Apple menu > System Preferences, and then click Mouse.
- Set the sliders. As you adjust the sliders, try moving and clicking your mouse to see the effect of your changes.
Tracking: Adjusts how fast the pointer moves when you drag the mouse.
Double-Click: Adjusts how rapidly you must click for the computer to recognize a double-click.
Scrolling (if your mouse has a scroll ball or wheel): Adjusts how quickly the pointer moves when you scroll. The scroll ball doesn’t scroll menus or sliders in dialogs.
If you use a Magic Mouse or other device with multiple buttons, you’ll see additional options.
If you have trouble using the mouse, you can use the numeric keypad to move the mouse pointer and click. To make this and other adjustments, open Accessibility preferences, and then click Mouse.