I think that would still be useful. A hint would be useful on such a button explaining that once you duplicate ad it's set into the same ad type.

What  about letting admin users push to our "duplicated/cloned" skins? Right now have to zip up my git folder, then import it and mess about with metadata and possibly switching url skin options under settings -> url. Lots of extra steps that could be sidestepped with being able to push to that skin.