Personally I wouldn't bother with Bi-wiring, might as well just buy better speaker cables.
But Bi-amping is another thing... Some people swear by bi-amping, but some speakers don't seem to suit it. You've got 190W per channel into 6ohms, into the 6Ohm 100W RMS nominal RS5 (don't worry, MAs can handle a lot of extra power). You could give it a whirl, but I think with the amount of power and control of the sc-lx82, you may not gain anything...