A trickster.
An inventor.
A savant.
Someone who is skilled in their trade; an artisan.
A member of the military who specializes in manufacturing and repairing weapon systems.
One who drives quickly or without subtlety, one who often engages in and/or is fond of slamming and flooring the accelerator often.
A driver who does not compensate the throttle position of the vehicle for road conditions or terrain, invariably slowing down while going uphill and speeding up while going downhill.