I have an idea. The develelopers should work on putting fully customizable gearboxes, to use with car engines, so you can rotate parts at variable higher speeds, to use in helicopters, cars, boats, and even planes. The should have customizable gearing ratios, axis lengths. This should include angled gearboxes, differentials, and axles to connect gearboxes to parts, and rotating mounts., kinda like the drive train on a car. Anyways, I can think of many ways users could use this, in their inventive creations.