Japanese keyboards frequently include Roman characters. It's a mess, really, a keyboard with extra shift keys and every key has four characters on it. I don't know how they type. I think since FFXI runs over windows, and uses some windows software to operate (I mean like the animated cursor) that maybe if you installed a Japanese language pack, and purchased a Japanese keyboard, you would be able to type in Japanese also.
Just a thought, if anyone has the energy to confirm I'd love to know.
