You can achieve this effect my mapping the folder as a separate drive, that way causing the "copy default" behaviour when dragging to that folder?
This can be done on the command line using
subst <driveletter> <folder path>
Or you download and use Visual Subst.
I've tested it out (using the command line), and it does seem to work (giving the default drag-and-drop copy effect).
I haven't tried Visual Subst, but saw it mentioned online. The only advantage they mention is that it allows you to ask it to remap the drive on startup, but you can achieve this easily using the command line, by putting the command in a script and placing in the