Hi Ben.
Sorry my bad knowledge about WP but I do not understand that… vendors have their own media section so they can edit only their own pictures. How they can screw-up the web site??
If they are up-loading pictures but later they want change them. If they are not able tu erase the old one I will have a web site full of trush.
I have been asking them to use a good selection on names for help with seo’s but if they are not able to modify pictures’ names how they can do that properly?