Tracks
I know the game is coming out soon in a couple of weeks, but it would be cool for a game update where we can build our own tracks and put them into my player mode, and my team mode.
Forum Discussion
As much as this is a good idea, personally its not a feature that i could ever see being added in the game as i feel it would cause more issues in the game than benefit to players.
I imagine that it would require heavy moderation and its whether the devs would be able to monitor this while also maintaining other areas.