Hi Jim,
I apologize for the delayed reply. There is no support for shared link password protection yet, but I'll try to push this feature forward and see if we can add it. I'll get back to you when I have more details.
Normally I wouldn't have anything against publishing our web application so that it could be self-hosted. However it would require a lot more work to package and document it properly so that it could be used by others. There is also additional support effort to consider. This would probably need to be an additional paid option.