I have a dozen or so listings that I use as templates, setup with artwork or shipping parameters and when I want to create a new listing, I just duplicate the ‘master’ template. But occasionally I edit the master template, forgetting to duplicate it first. That requires me to back out my changes and re-save the template.
If I could ‘lock’ a listing, that would keep me from inadvertently making changes to it until I ‘unlocked’ it.