Separate audio sources for HDMI and optical?

Question

Hi there,
I'm setting up an Apple TV 2nd gen for my parents. I want to set it up in the following way:
How do I set it up so that when they're watching Netflix (or whatever), audio comes through HDMI, but when they're using airplay wirelessly with the iPad, audio comes through the optical cable? Currently, it's an all or nothing kind of thing... without the optical cable plugged in, EVERYTHING plays through HDMI. But when we plug in the optical cable, EVERYTHING plays through optical.
The way their A/V receiver is set up is that the HDMI port is on zone 1, where the speakers are in the bedroom, and optical is set up for zone 2, which goes to the speakers on the back porch, so obviously they don't want audio going out there when they're watching videos.

Answer 1

No, just that the sales guy at the Apple Store said this could be done. Ah well, pretty much par for the course for Apple products. They work how most people want them to work (or more specifically, how Steve wanted them to work), but the minute you need to do something that's slightly out of the ordinary, you're pretty much out of luck, because they give end users so little control over anything.