Here's another suggestion that comes out of my recent experience setting up a DMX solution, sorting a large number of files into categories and folders, and setting access permissions.
I often want to set the same permssions, or assign the same categories, to a several files/folders. If on the Selection menu there was a Permissions and a Categories option, that would save a lot of time. They would not have to figure out if the items in the selection already shared the same permissions/categories, just allow them to be reset.