1) Yep, the surround back is mono.
2) The speaker setup screen includes an option to have no surround back, two surround back, or just one surround back. If you do the latter, you connect the left surround back channel to your amp for the single surround back speaker (or to your amp channel that is driving two speakers, as in your case) and you're good to go. This is what I'm doing, actually.
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