After the code was written about 12 years ago, the business folks at TriMet who use the software haven't prioritized further enhancements. I wrote the code and put it up on Google code (and hap-haphazardly moved to github when google shut down their service). Folks have taken the code, and either ran it as-is, or customized things to work in their environment.
That said, I think there's a lot of room for improvement. I've added to my todo list to get the code in better shape on github to accept pull-requests.