Vista - Directing sound through multiple sound cards

In Vista Beta 2 there was an option to direct sound from different programs
through different sound cards - eg I could set my surround sound card as the
default for movies but just use my motherboard onboard sound for music and
applications sounds. Where has this option gone in RC1?

Another issue I'm having: no matter which of my sound cards I try to use, I
can't get sound from DVD's or some digital TV channels. I think it's the
channels that use Dolby, but I'm not sure. I've hunted through every options
dialogue I can find and I just can't fix the problem. All I hear when I try
to view one of these sources is a bit of deep crackle, then nothing.

Regarding my second issue, I just read a post from September indicating a bug
with AMD K7 family processors and the WMP audio decoder. I have a K7
processor. As I am apparently too late to get RC2, are there any other
workarounds for this issue?