It would be nice (and realistic!) if you would add an option to bind the wheel pedal to throttle in engine testing. I know the engine designer is currently locked, but as soon as its unlocked, I would like to see this feature! 
I see why you might want this, but seriously, who is going to plug in a racing wheel to a car tycoon game where you cannot drive cars?
Well… I see the point. But, as Jakgoe said, there’s not much need for it. I would like to do this if there was the option, though
Or the Toyota bugged gas pedal 