The ability to list to .ca, .uk & .au was added in January. I've only used it once (promo day) and had no major problems. Really the only issue was changing the shipping options and items specifics which are different on .ca than .com
As for taxes, this has never been a problem with Blackthorne presuming you are not using "checkout".
From my limited use on .ca the only clunky part is if you are trying to list to .ca AND .com, in that case you need to maintain two sets of inventory items although I'm lead to believe that the inventory control can be spread across both sets of inventory (I don't use the inventory control features myself).

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.