You're limited in your options. The passthrough is what you've found out, the receiver doesn't process the signal from HDMI at all so no audio out of your receiver. The optical cable is really your only other option for multi-channel sound as the PS3 does not support more than 2-channel analogue out. As you've correctly surmised, you're limited to DD or DTS over optical. If the PS3 gives you the option pick DTS as it supports up to 1.5mbs which should give you the best quality (equivalent to DD+) but obviously less than the lossless codecs or LPCM. However, through the system you're talking about that won't make a difference as it's not resolving enough to show any benefit over DTS.
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