This would add different engine types to be available for use in ships, that would boost some stats. For example, a Boiler would increase the power of your legs on your massive landship, make them faster, and act as a secondary engine in case the one in the legs is out of crew or broken. Then you would have Suspendium Boosters, small suspendium drives that decrease the weight of your machine only.
With that, add Diesel engines and Diesel. These would be the most fuel-efficient systems in the game.
Diesels are planned i think