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Well, I infer that a basic FET will get triggered by a gate signal to suck power from a power source (like, the 4 AAA batteries that plug into the car system), and the drain current will pull from that source.
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What I'm hearing is that you'd like to try using a separate power supply that the FET's will be turning on and off to the motor. Separate as in having one to run the electronics of the car, and the other solely for the main motor.
That is exactly the principle behind the relay mod(by Chino). He taps into a series combination of batteries(however long), at just the point where he can run his car without frying it(say in between the 4th and 5th AAA) and then connects relays to the end of the rest of the series combination, thus using the original motor wires as just a signal to turn relays on and off which turns the motor on and off. You can use as many AAA's as you'd like. He's getting speeds over 80kph using this method.
My regulator method works on the same principle as well, although there's no tapping of the series combination of batteries, and the regulator is choking the voltage down to 5V for the elecs. and allowing the "whole" supply to power the motor.
Either method will work in giving tremendous speed. And there's one thing that's common with both methods as far as the wiring goes......the power sources to the motor and the elecs. have to share the same ground. You can't have one battery for the elecs. and the other for the motor. That won't work.