Script to add to iTunes without copying file?

If you hold Option while drag/dropping a file into iTunes, it adds it without moving the file to your iTunes Media folder, it leaves it where it is. Very useful when you want to have all your movies on an external HD.

Is there a way to automate this using a script? I'm sure there are lots of simple scripts out there which will import a file into iTunes, but I specifically need the script equivalent of holding the Option key while importing.

To be clear, I DO NOT want to simply turn of the global iTunes setting about copying files on import.

Thanks!