Here's a new screenshot of the track editor. I haven't had as much time to work on it because the Calculus class I'm enrolled in is keeping me very busy. However, in the past week, I was able to make a panel (seen on the right) that allows you to select the race track tiles you want.

You use the mouse now (previously the arrowkeys) to drag and drop tiles. I figure the mouse is better for this, since the arrow keys are pretty retro.

Over the next few day I plan to improve the track editor and make some small updates to the website.