I've tried to create an event for the 'copy' command like this:
theFile = new File("f:/testCopyEventAlert.jsx");
app.notifiers.add("copy", theFile);
and the testCopyEventAlert.jsx looked like this:
alert("COPY");
but the event manager didn't triggered my alert all the time I was copying a layer. So I've tried another way, to create a panel that will listen for the copy event, this time the event was catch but with a bit of delay. You can check the panel here:
To install it just extract the archive in (your Photoshop installation folder)/Plug-ins/Panels. Than open Photoshop and go to Window>Extensions>BCM_copyAlert.
and If you like the idea I can try to catch the move event also...or I can share the FlashDevelopper sources so you can make changes on it.