Yeah it seems to be the only way at the moment. I was just hoping a trademe support person would see this and add it to the pile of things to do. One can hope!
Can an address search field be given for shipping estimates when listing an item? This would allow for much better estimates. A quick test using a listing book a courier vs TM's book a courier service, I see prices that are quite different Wellington vs Upper Hutt/Lower hutt/Porirua for example. I've been caught out a few times with having to cover extra shipping costs.