This would be handy, but just as handy as being able to update published products anywhere in store (like changing script or sample placeholder photos), without HAVING to post them “new” to the market place all over again & loosing all previous statistics. This is something Zazzle has not figured out how to over come.
I used to have a Redbubble store and THEY knew how to do this: I could make any adjustment or change on an already published product, hit save and it would simply update. Done. Really, the knowledge is out there already.