ROFL, that was exactly what I was saying... except that "they" was meant to say "the", lol... that keeps happening to me.
So, yes, the track has to have one single route that goes both ways. I figured some cross jumping is unavoidable, but it's awesome to try figuring out both way solutions for tricky places. Makes for some sweet forms in the track, especially jumps, actually.
I've already started (and kind of finished) a proper one, but need to make it longer (1:50 author thus far, damn it!). I love that challenge idea in general. I've just started with the track editor and to follow a given theme activates the whole mind in the exercise of building a track. Love it!
My maps are nothing, yet, though, just some early stumblings... but it's all fun.
SO: THANK YOU (by the way) !