I found out this little "bug" a couple months back. But I've been using it a little bit differently. I've used it to create spy & terrorist units. Not giving them any attack points, but giving them the pillage function. I've positioned them at rival cities strategic resources as well as capitals. If they all of a sudden declare war on me or any of my friendly civs, they then begin losing resources necessary for their attacking units, plus I knock off communication with their capital. Wars don't seem to last very long then.
It's helpful at keeping those war-mongoring nations at bay.
