I think most customers just have people with editor roles do this. At the moment I don’t think you can give this permission to authors without making them editors. The granularity of permissions in the Channel Manager is still quite rough.
Quickly trying out granting hippo:editor to authors I found out that authors basically get editor privileges with this. This would be a difficult thing to achieve imo with just security domains configuraiton (also note that v14 is coming up, and the security domains will have to be migrated).
Perhaps a custom workflow action ? https://documentation.bloomreach.com/library/concepts/workflow/custom-workflow.html
Also see what the actual copy action does here:
In the upcoming brXM v14 this will become supported out-of-the-box!
We’ve changed the set of permissions (and implementation) for content authors to also allow copy/rename/move/delete for unpublished documents. Only editors retain the permission for (de)publish.