It would be handy if you could clone a Content Specification. Eg. You might be able to use a Content Spec for EPP 6 using the same guide from EAP 6.
With this command you should also be able to clone a content spec and remove all the revision numbers. A use case for this would be if say I've frozen a content spec for a GA release and then want to clone it to work on the next release.
+1 to this feature. Particularly if you could add this functionality into the docbuilder main menu as a button option.