Moving files to the end of a drive is a great idea - I can't find a utility like it in all the searches I've tried.
But SIZE is not the best reason to move a file to the end of the drive - I'd assert that "dormant" files are more
appropriate. But rather than argue that point, why not REMOVE "move to end of drive" altogether from Defraggler,
and make it a whole new product that lets the user select "aged", "large", "stupid", or whatever criteria should be moved?