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Thinking about just changing voltage, but not amperage is also a little weird because there isn't a good way to change voltage on the fly.
Typically, voltage is fixed by how many batteries you have. Amperage is controlled by the motor controller by how far you press down the go pedal.
An exception to this would be a Citicar with an original contactor controller. The go pedal actually controls a series of switches that combine the batteries in in either series or parallel, with "1st gear" being the batteries in parallel, but running through a resistor. Instead of the throttle controlling amperage, it controls whether the batteries give 12, 24, or 48 volts to the motor.
It's also very annoying, as there is a loud click every time you change from one "gear" to another.
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