I was looking for a solution to the same issue and found the answers on the forum equally useless, but I think I found a way to do it. Sort of a work around.
You can apply tax to a location that you define, so a country or a state. You can then define the tax as a % or a flat fee. You can customize the description the buyer sees for the fee.
So, if I'm a US seller and I want to ship to Germany, I know Germany costs about $10 extra to ship to. I create a Germany location and apply a Sale Tax to it of $10. Then I edit the description of the fee to say International Shipping Rate to Germany.
It's not perfect, but does the job.