> If you want to toggle the engine and can't figure out how to do so in a menu that says "turn (on/off) engine", there's no hope for you.

That's not the point. Anything that might get in someone's way **will** get in someone's way eventually. If the reader missed the "in the vehicle controls menu" part of that sentence, they'll be looking everywhere, complaining, and likely eventually feeling stupid when they do see it -- and you do **not** want to make people feel stupid if you can avoid it.