First, I want to say how much I love this plugin! Thank you for developing it.
I would like to suggest something to add to it, though. I live in Italy, and shipping costs the same everywhere in the country EXCEPT to Calabria, Sicilia, and Sardegna. It costs more to ship to those regions because they are islands, but with your plugin it isn't possible to differentiate. Would it be possible to add them to the 'country' list? I know they aren't countries, but shipping companies calculate shipping to them like they are. Thank you!