The site is very scarce on details, but the reason no OpenNAP clients supports multisourcing is that the underlying protocol does not support it. Unlike Gnutella, OpenNAP has resisted proprietary/incompatible extensions so far, and I imagine that's exactly what these guys did; I bet you can only multicource from other same clients.
Not that it's a bad idea, just that it's not likely to succeed.
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