Why are there no custom races? It wouldn’t be that hard to include placing your own chackpoints would it? I played online the other day with friends and we were out of tracks to run in no time. I see all kinds of awesome places to make my own tracks but no dice. I hope they add this because I am bored of the included tracks.
Perhaps a waypoint editor will come in the future. I would definitely post this in the wishlist thread, and look around the forums here - there are a couple other threads discussing this as well.