just so you know, I'm working on it. Don't update to WP 3.0 yet, as the current version of qT won't be working with it. WP 3.0 has quite a lot of chances, so it might take me a while to make a stable version.
whoops! Just did it Nothing bad seemed to have happened (Except to the editor which wasn't working in dual language mode anymore, but you can add the language tags manually, no big deal), but now I notice that clicking on the category pageswith the language pre-path makes the site go into a redirection loop.