At the time I used Xubuntu, it did not have touchpad support or touchpasd settings. I installed the patch but it still read my Alps touchpad as a PS/2 mouse and every hand motion anywhere near it as a click. It kep zooming here and there and clicking this and that as I was typing.
KMouseTool clicks the mouse whenever the mouse cursor pauses briefly. It was designed to help those with repetitive strain injuries, for whom pressing buttons hurts.
For me pressing buttons isn't one of the problems. But random mouse/touchpad clicks have been one of the problems.
The most important input-device issues:
1. Being able to disable the touchpad.
2. Being able to enable the joystick [since it doesn't require me to twist my elbow out of shape like the keyboard and mouse do].
The most important desktop issues:
1. Respecting my settings for brightness and volume. I have light sensitivity issues and bright screens make my eyes hurt.
2. Being able to switch back and forth between open files without trouble. and without alt-something.
3. Being able to access my files as quickly as possible, without too many mouse clicks, searches, or typing.