Did you pass English class?
My third point was addressing the fact that the tires smoke even when you're driving along in a straight line, with no tire skid and no slip angle. Once the tires get a hot spot, that spot will smoke every time it touches the pavement. If you drive along with one hot section of tire, you'll get a small puff of smoke every time that section touches the ground.
I realize that the smoke can be somewhat of a CPU hog. I also realize that Scawen is a pretty talented guy who might be able to optimize the current code further, or implement some other way of handling the smoke that is less processor intensive. There are plenty of other things that should probably take priority over this, but you never know when he'll be mucking around in that portion of the code and decide to make a change.