I completely agree, I'm not going to spend time fixing something when the creator can and will (eventually) do it better. The thing is, the maps do work for me. I'm curious about whether this is because of the small change to race_server.lua, some acl setting, or race is just a temperamental bitch.
EDIT: OK I think I've found out what the problem is. Race seems to have different 'modes', and if a map doesn't match one of these modes then it wont load.
- Destruction derby
No checkpoints, no respawn - Freeroam
No checkpoints, respawn mode is timelimit - Sprint
Checkpoints, respawn mode is timelimit
EDITEDIT: I added a mode for races with checkpoints and no respawn, the only changed files are meta.xml and a new file oldschool.lua, but I'll put the whole thing here. Maybe I lied a little about fixing it but I want it to work