We'd like to have a Restricted content option exactly like that in Photo Center. This would require appropriate options in the Permissions tool to Use or Create restricted content.
This would allow teams to create Composer content for a specific website, but editing of the material would be restricted to only those permissioned. Now, any content set for a website is open for editing by any user with Composer edit rights for that website.
We need a bit more granular settings to restrict it further.