The Mousetweaks package provides mouse accessibility enhancements for the 
GNOME desktop. 

These enhancements are:
	
1. It offers a way to perform the various clicks without using any 
hardware button.

2. It allows users to perform a right click by doing a click&hold of the 
left mousebutton. (For a left-handed mouse user, the termes left and right 
have to be inverted.) 

3. It provides an applet that the user can install on a panel. This applet 
creates an area on the panel into which the pointer can be captured until 
the user releases it with a predefined button and modifier combination.

WWW: https://launchpad.net/mousetweaks/