Expand remote directory on drag, hover

In Windows Explorer when you're dragging a file or folder into a given directory, if you hover over that directory (while dragging the file or folder) the target directory is expanded so as to show all its sub-directories. This is helpful as simple navigational shortcut as well as as a correctional help when you didn't open deep enough and for myriad other obvious reasons. I suggest a similar feature for remote directories. This would, of course, require downloading the directory structure of un-traversed directories, sometimes, but that's really the whole usefulness of it.[/url]