1. Make the thing completely configurable with a file.
2. Add an optional switch to select the location of the config file.
3. Always ship a well commented, sensible config file with the application. Document environment variables there, if any.
4. If it makes sense, add the ability generate a default config file if it's missing.
5. Always add a logger, with good debug and error output (Dovecot is my inspiration and role model there).
6. Document everything in the code, and in the documentation if possible (external documentation is not my strong part yet. I can't write it fast enough).
