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Thing is, a lot of the throttles are just a 0-5k ohm pot with a micro switch to turn it off 100% when it's at -0- so adding another resister in there to vary the input is pretty easy, same with having another throttle in parallel, so say you tend to drive only a few miles to work every day, you can crank up the boost and once up to speed take your foot off the gas, keep the car in gear and use the thumb throttle to maintain speed for a few miles, not as efficient of course as it would be if the engine was not turning at all, but much simpler.
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