I know this is an airplane game, but i love making cars. So, I think it would be a great idea to add some extra parts and stuff like that. My first idea is a manual gearbox with customiseable gear lenghts and gears that automatically switch when accelerating or braking. My second idea is customiseable engine sound for if you want your cars to sound different than other cars. Please let me know what you think of my idea in the comments.