I needed to send a copy of an IPTC caption to an editor who is IPTC challenged. I pulled up the image and clicked the "I" and got the IPTC menu. I then selected the caption data but there was no right click dropdown menu nor access to an "edit" menu to copy the data. I finally saved the IPTC data to a file and edited the file but Cut & Paste would have been much nicer/easier.
Kirk, I am still recovering computer-wise which is why I haven't responded to your offer.