BiWire Jumpers on biwireable speakers.

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There are an infinite number of things for which there is no proof that they do or do not affect the sound of an audio system, and so for which one could construct an argument that they should "be considered" as a potential source of sound differences.  This includes an infinite number of things that vary with time outside our control, to the extent that as we are listening to a system we could not be sure that its sound quality is not changing from one microsecond to the next, independent of the music (if any) being played.

To avoid that kind of madness, I think we each have to have some kind of criteria for making decisions about what is reasonably likely to affect sound quality.  Personally I prefer to trust science, engineering, and common sense to help me make those decisions.

In short, I'm firmly with @Pim on this one.