Development has restarted on GitHub
Thank you for your input. The development on this project has been a bit stale for many years, but has now (just a few months back) been restarted on GitHub. https://github.com/gerbv . Please refer to that site and they also make all the calls. (Yes, I saw your issue on gerbv and wanted to assure you that the GitHub site is now the center of development.)
Export selected layers to ZIP
A set of 21 patches from 2009 to implement zip file handling.