It would be useful if you were able to add products to a folder on Dropbox and then autopopulate the "Unused" section of the file. A folder in dropbox could be autochecked and imported every time we started up later with a confirmation box asking if we wanted to add them.
The second iteration of this would be a place where we could literally just put URLs in a list format and Later would add them to unused.
At the bare minimum, I think you should be able to start a Dropbox folder as a "favorite" so that you can shortcut your way then when clicking on Dropbox to add photos. The folder I use to add products to to my unused section is nested 5 layers deep. I'd love to be able to just start that folder and then start out from there.