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I don't have a receiver that has that option. However, the front effects channels are used to output the DSP information. Having them on leaves the front left/right channels untainted. If you don't use the DSP settings then you won't get any benefit from them.
By not having speakers connected to them, all you're doing is having the information mixed in with the front left/right.
Wire 2 surrounds in the front, and give it a go. If you think it helps out with the DSP, and you use the DSP then by all means go for it. But, don't think that it's 2 extra channels that're derived on normal non-DSP use.
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