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In case it doesn't immediately show, I have no idea how the "behind the scenes" of the game works. Barn doors on the D-Series like the Roamer...
Maybe add loud engine noise to Jake brake for Semi instead of just popping Heavy equipment such as different size skidsteers, forklifts, and...
What if for the cams on like the v8, instead of having a rough idle that is randomly varying, you could have a kind of adjustable throttle input...
What if there was a workshop where you could make custom vehicles, or custom parts, engines, or accessories (like a snow plow for the D series...