Hey all,
I have developed a free piece of software that attempts to give the user the best of both worlds re: low sensitivity (accurate aiming) vs high sensitivity (easy to look around large amounts).
It works like this:
Under normal operation (Mouse kept on mat), it does not affect anything, but if you lift the mouse *whilst it is in motion*, it keeps moving the mouse cursor until you place the mouse back on the mat.
The upshot is that you can "roll" or "spin" the mouse like a trackball to generate the large mouse movements (eg a 180deg turn), allowing you to keep the sensitivity low for high accuracy.
I have a forum post where you can discuss and find the download link, it is here:
http://ahkscript.org/boards/viewtopic.php?f=6&t=8439
There is no "install", it's just a portable EXE. It does not alter any windows settings or change anything on your PC. Source code is available for the paranoid / curious.
enjoy!