If the quote on the wall had given the rod a more colourful, phantastic name, I would be all for it, but "copy rod" sounds likes like a generic, unimaginative translation.
Given the series is known for translation changes, artifacts left over from previous builds, etc, "copy rod" was most likely an unintended fluke.
That being said, I would like to see some sort of doppleganger ability in a future installment.