I'd like to suggest adding a hidden setting to the H5P Content Type. With this setting, users with the capability to create H5P content would be able to decide when their content is ready to be shared with their community.

During editing, a checkbox could appear to make the content hidden. Hidden content would only appear in the list by its creator. A capability would enable certain managers/administrators to see hidden content.

I have successfully built a quick contenttype plugin to experiment with the idea. Would such a feature be acceptable for integration in the core H5P content type or would an alternative hideable H5P content type be the way to go? I can work on this.