File | Directory Input Dialog Boxes Should Support Drag & Drop
Any place that you might be required to input a directory/file name, should accept drag & drop.
Change Directory (Shift+F7), Compare Files (Ctrl+Shift+C), ...
Take a look at WinDiff UI (aka RunWinDiff) or DragDropUpload.
A better front end to WinDiff - The Code Project - Free Tools
http://www.codeproject.com/tools/runwindiff.asp
DragDropUpload - Teslacore
http://www.teslacore.it/wiki/index.php? ... DropUpload