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Join Date: Oct 2001
Location: Monterey Park, CA
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Like you said, the manuals aren't out for those two players, so there's now way to know for sure whether you can set them to output 7.1-channel soundtracks (especially LPCM) as 5.1 via the analogue outputs. It's most likely they will downmix the 4 surround channels to 2, but no way to confirm right now.
I wouldn't recommend not connecting the surround-back outputs, since you'll lose the information in those channels. Your only other option will be to use Y-connectors to combine surround and surround-back channels. Unfortunately, this won't combine the channels properly (compared to downmixing), but I don't see any other alternative.
Hopefully both players will do downmixing, so you won't have to resort to Y-connectors.