Actually Phantom a small correction:
We need full flexibility to issue 1 new Asset name for each Silver/Gold/Whatever physical asset if needs arise from our customers either at issuance or redemption.
Of course you'll have the ability to do that. But I think that there will be downsides in usability. (For instance, it will be harder to trade them on the distributed exchange if a price cannot be established. If all of the silver coins are the same, then they should be priced the same.)