Wow, Thanks for that, I'll go and have a play! I think I can move the actual referenced file around too - that could be Good-bye to lightroom completely!
Not sure what you mean by move but Aperture has had the ability to move files around (ever since Aperture included the ability to use referenced files (files not physically located in Aperture's library database)).
If your files are managed (in the Aperture Library) they can be moved out of the library and become referenced files via "File>Relocate Master".
If your files are referenced (in your own folders, etc.) they can be moved anywhere on your computer or ext. hard drives via "File>Relocate Masters for Project".
If you move your files and they become disconnected from the Aperture Library, Aperture will still list them and show a lower res. preview, and you can reconnect the referenced files to the Aperture database via "File>Locate Referenced Files".