Didn't you read the description? Enter to start! No other controls! No clutch! Only start engine! edit: ooops! clutch up arrowkey and enter to start, but it reads already in scene!
My dad cars: Volvo (Amazon), Mercedes benz(I don't remember much, but it's pretty old), Mercedes-benz(560sec or something like it), Mitsubishi (sigma).
p.s. great car 9/10!
For me the hinges are randomly placed and streched in almost every scene. That makes things explode. But when you reload the scene everything is normal. Just undo load scene and the redo.