I'm afraid it still isn't working for me. The only way I have got round it for now is to set a negative amount for a voucher code and ask international customers to enter that code. For example, international orders may be £10 delivery, so I set a voucher code for -£10 (as they are a negative amount by default so entering a negative amount in there will turn it in to an addition to the cost). Then I edited the page to add a message to prompt the user to do that.
Hope that helps!