You can manipulate the TechRacer “map” quite badly. For example, if you start a TechRacer game while having an image map selected, you start with the image map plus the girders placed. Very weird and probably not intended.

The same is true for hand-drawn maps (you can mess around a lot here!).

I used r9819e69bc6db on GNU/Linux.

Huh. How is that bad? Sounds pretty cool actually.
Disclaimer, haven't actually played techracer yet.