The reason for the double chain on pedals is their inherently small size.No. A single chain pedal is just as good as a double chain pedal. I play metal with 20 year old single chain pedals without issue.
Yes two chains is stronger than one. It's still a chain. Drum pedals are the only chain operated thing I can think of with a double chain. This includes bicycles, motorcycles, and chainsaws. I have seen (and broken in some cases) cams, footboards, and uprights, but never a chain.
But I think the double chain has more to do with the chains' durability than any added performance or better feel.