I'm not familiar with that specific receiver, however I think most if not all of them can use the surround back speaker as a mono back surround (if you set up the reciever accordingly); meaning 7.1 will take the 2 back surround tracks and make 1 back surround track out of it.
For 5.1 it depends wether you like things like PLII (personally I don't). Plus you would have to find out if your receiver can apply DSP modes on anything else than DD or DTS (in case you use a PS3 for example that is set for PCM output over HDMI).
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