I just ran into this issue.The reasoning for not allowing it doesn't make sense to me.  Adding shipping options does not change what bidders have already agreed to pay.  Changing existing shipping options is different.  We're talking about adding the shipping options, where there were none before.I have a listing that I was originally not prepared to ship at all i.e. pick up only.  Now I want to show shipping costs but it won't let me.  I can't even use the calculator.  Now I have to do a dummy book a courier with a made up address for each different destination city a buyer asks about (the...