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My theory is that after a break in period, the two chains would share the load. if you use two off the shelf sprokets and bolt them on with the same bolts, they will be in time. if they are off slightly, one will wear enought that the other one takes on the extra load and from then on the load will be distributed evenly. As for the silent chain.....cost.
What in the hell makes enough power to need twin 630's?
I also agree, I am working on a new dual chain setup and I was concerned in the beginning about one stretching more than the other, but if you think about it, one chain can't stretch more than the other since it has to pull on the other chain at the same time, so right after break in, I think they would have the exact same amount of slack as one another. I'll be running dual 630's on my setup...