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I have recently successfully spliced the USB cable shipped with the Create. You may have come across this tutorial on how to create a serial to USB cable. I believe there are only 4 pins used to communicate with the robot and the remaining 3 unused pins include an unregulated power source and ground. Unfortunately, upon inspecting the cable these 3 pins were not actually connected to the insulated wires inside the cable. I ended up just salvaging the USB end of the cable and soldering my own 7-pin connector at the other end. I connected a voltage regulator to a pair of the unused power and ground wires and was able to power a RaspberryPi no problem :)
I only required 5V, but if I recall correctly the unregulated power line puts out about 14V. In any case you'll probably need a regulator.
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