I don't know if this is even appropriate for KM, but I really miss an extension I once had which would allow me to move or copy a file or folder to a new folder via a contextual menu item that let me drill down into the folder hierarchy via spring-loaded folders.
Example: Right-click on a file or folder to open up its contextual menu. Choose the item "move to new location" or "copy to new location." This opens a fly-out menu (in column view) which begins at root-level, and lets you drill down via spring-loaded folders to a target folder anywhere in the hierarchy. When you've dropped the file or folder, the contextual menu snaps shut-- although I think holding down the option key might have kept the target folder open.
This made it so easy to go through my folders and move stuff to other locations-- but at some point, the extension was no longer supported by the Mac OS, so I had to go back to opening the target folder in a new window.
Is there any way a KM macro could give me back that sort of functionality?