Don't believe everything Dolby Labs tells you ( ), and again, this DVD was a "Proof in Concept" - not intended as a final product. It also contains my 5.1 soundtrack created from the PCM (which a great deal of research and effort went into, as opposed to some sets that just drop a WAV file into a AC3 encoder.)
Besides, with just a few tweaks, the video would have taken up far less space, and looked immensely better as well.