@ vinx77
I thought about that initially, when the client brought up the multilingual idea (before doing any research). I'm sure that would work, but would be quite a mess to maintain. A better solution is probably the WPML plugin. However, there is an associated cost (for most) and when I looked into it, it seemed rather complex to get going compared to qTranslate. That may have changed, and I intend to look into it again.
It seems clear that Yoast isn't going to officially work with qTranslate, as they won't even answer these kind of questions. It seems it does work with WPML, from what I've read... so I guess that must be about as official word as they are going to give us. (I have no clue why they can't give us a better answer... there must be some kind of politics or egos involved, etc. Sigh.)