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Anyone ever use the optical audio out on the back of the PS2?
I never had the amplifier to plug it in to back in the day, but I do now.

I also have a digital audio card on my motherboard (like everyone these days) with an AC3 5.1 Surround alsa output controlled by pulseaudio. If PCSX2 could output a digital audio stream, pulseaudio could pass it through to the amp.

Do any games have enhanced digital sound? Surround Sound? Dolby Digital?

Very few do. It's usually an FMV that can be set to use 5.1 audio (AC3). One such example is the Ar Tonelico 2 intro.
We don't support this though. We tried once but there were issues we couldn't fix back then so it was dropped.
You can get a similar quality from setting your decoder to ProLogic 2 (try the movie setting). At least in AR1 and AR2, you'll
clearly hear it has been PL2 encoded for regular stereo