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That somehow assumes that your amperage is somehow being limited by the batteries, NOT the controller.
Unless you are drag-racing or doing something else equally unusual, being able to pull more amperage from the batteries isn't going to help any, and having lower system voltage will drop your speed.
One "hybrid" system I have thought about before is to have contactors switch between the controller to the motor, and an extra-long series string of batteries straight to the motor.
Imagine you have a 72V system - 6 x12V batteries. You have a 72V controller, and upgrading to a bigger one costs more than you want to spend.
You could have one or extra batteries and contactors to disconnect the controller, and connect the other batteries in series with your main string. You now have a 82 or 86V OVERDRIVE for max speed!
In fact, many EV potentiometers have a microswitch on the minumum potentiometer end. You could just as easy put one on the high end to control the contactors.
Press down the gas pedal - start going - press further - go faster - press all the way down - CLICK! - FULL MAX VOLTAGE/MAX SPEED!
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