So, I know currently we can edit in mass, the author, etc:
I would love to see the ability to upload thumbnails in mass. Today I had to go through and add 33 thumbnails, and it take forever to load the page, click on the box, find the thumbnail locally, have it upload, then click save, and repeat 32 more times.
Also, it would be great to see the ability to edit things like the description and anything else, that is currently standard.