I'd like to see more sophisticated uploading added to the webfilemanager. I'm currently using Dean Brettle's NeatUpload to allow users to upload large files and show progess but it would be great if you could add similar features to the manager.
My main feature that I would love to see if the ability for users to drag and drop multiple files into the webbrowser and onto the webmanager and have the webmanager recoginze this and initiate and upload of those files. The existing drag and drop feature is fantastic in the browser window, I think this is the next logical step.
Here's a demo of NeatUpload.