You may be able to remove the 12V supply if you want. You would remove the output transistor feeding the feed inductors and put your 5V control line there. You would want to scale down the 2.2Kohm by the common port to keep the same current through all the diodes as you would with a 12V supply (1kohm would probably work).
Mmm.. I think something like that might be quite useful. I wonder if a slightly less-intrusive modification might work: simply replace the +12V wire with the +5V from the USB cable, and change out the 2.2K resistor for a 1K value ?
I'll have to open it up again and try it.
Cheers
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