Why such harsh responses to ScruffyNerfHerder's idea? It was clearly just a rough draft suggestion offered as a possible solution to the 8 audio track limitations Harmy's encountered. I think he clearly understands it's not the ideal arrangement, but it's better than nothing at all.
Hopefully the multiAVCHD lead will produce the results we want. Either way, thanks for providing food for thought, Scruffy.