Here's how you can participate:
If you notice something's not working quite as it should or that a feature you need is missing, please don't hesitate to contact me. Email me at [email protected]. I'm msaari on Twitter and BoardGameGeek, if you prefer.
18SH thread at BoardGameGeek is a good place to ask questions if you're a BGG user.
Feel free to post issues and do pull requests. If pull requests come with tests (18SH uses Mocha + Chai for testing), that's even better.