Not left to right, but up and down. On all games that use mouse there is the option, so I thought the runtime would have it built in. I'm dyslexic, so I always play games with inverse mouse. I tried to play this last night, and couldn't control the car since I was always looking all the way down or all the way up.
Maybe there is a config file attached to the runtime engine?
EDIT: Found it.
On the main menu, hit the ' key to bring up the console, then type "invertmouse" without the quotes.