Whenever I hand-sign a book, I like to make each one individual. Some get a little bit longer of a thank you, some include personal references if I've had lengthy interactions with the backer, and some get one of my 'Meta-Feats', which provide a little tongue-in-cheek benefit, often with a once per session or once per campaign limit.
However, because of the venues we're using for international fulfillment, I've been informed I can't specify which book goes to which backer. This means that all members of the same geographic area will be forced to get the same message. Because of this, international backers will be getting slightly longer messages and a few more meta feats, as a way to make up for that.
We're in the middle of fulfilling Canadian orders now and, being a dual US/Canada citizen myself, I may have gone a little bit overboard with making fun of America's stereotypes about Canada.
So Canadian backers, I apologize you'll all be getting the same message from me. To make up for that, please enjoy being able to body check people on the ice, being masters of the frontier, and stopping combats through the power of being Canadian.