Stick a hollow cylinder to your optical mouse using m-seal
hypotheticaly: open the shell, extract the circuitry and with the sensor pointing down, stick it onto a cylindrical mseal shell. you should end up with a very odd light pen!
it is tough. and u definately cannot fit the sensor on the tip of a pen! even if u did then u would have a hard time tracking the location of the pen on a surface. tho movement sensing will be easy.
but u can try other stuff life rip of a touchpad from a laptop etc and use it with a stylus. will ive better results.
if u are all electronics and geeky the u can build a pressure tablet.
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