MagicPrefs is a free menubar and preference pane application for OSX which aims to improve the functionality and configuration options of the Apple Magic Mouse, Magic Trackpad and the MacBook glass trackpad.
It features the ability to bind a variable number of finger clicks, taps, swipes, pinch and other gestures to functions like Middle Click , Hold Down Both Mouse Buttons , Spaces , Expose, Dashboard , Recent Applications, Tweet, Read Tweets, Google Reader etc.
Touch Sensitivity implements a single point control for a number of factors impacting the algorithms of the taps, swipes, pinch and other gestures.
Tracking Speed adds the ability to increase the maximum mouse speed by an extra 200%.
Also featured is a real-time display of the fingers touching the surface of the mouse that you can enable to test and monitor the way the mouse sees your input.