I've finally added Plane Motion to the first post. It only took numerous revisions, but I'm quite happy with it now. It is of course inherently an airport track – still, I tried to add one or two braking points.
Small update since my tracks are now on PC, too. Most of this is old stuff, though. So far, only my Invisible Maze and Centre-Ville 9 have been published after the stunt update. Video of the stuntified version:
I've also added the following non-serious stuff to the OP:
Traditional track and field relay running race for two teams. Each team completes 6 laps in a relay format. Climb the ramp to pick up the baton at the start line marked on the ground. Then finish the lap and wait for your teammates to finish, or flex your muscles and get ready for another run. Requires at least 4 players (12 max).