A look at what is currently available on eBay
 Portable Finger Handheld USB Trackball 4D Mouse Mice US $12.79 
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 2.4G USB Wireless Trackball Handheld Optical Mice Mouse US $26.66
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 Portable Mini Finger Handheld USB Trackball Mouse Mice US $12.99
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In 'Enemy Territory: Quake Wars', can you use a USB Handheld Controller instead of a mouse and keyboard???
i don't know if the game originally supports it, but this handy little tool does it for any game you wish. try it out, it's very neat.
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