When a custom domain exists, allow a way for private bookmarks to be shared with it.
How do you envision this working? Like having a special URL you can generate and share for someone to view private bookmarks?
Essentially, yes. After setting up my domain with the links service, I thought I would be able to see my private links listed on it, but it turns out only my public links are available. I envision having an additional link visibility option, in addition to "Private" and "Public", that allows a link to be accessible on the custom domain.