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With all due respect (you have very extended knowledge and skills)
the "pool" you got set up is a workaround the decentralized nature of spreadcoin.
YES - it is a "pool" mining, and NO - there is no "breach" in spreadcoin's design,
which is meant to prevent/limit whatever pool mining. Let's not do semantics -
you proved there is a workaround for pool-like mining.
You might say: "It's not pool-like, it is pool mining" and technically you will be right,
but personally signing each miner's miner is an overkill just to prove a point.
Also you eliminate miner's choice of software, and while many people might be ok with that,
I (and many others I'm sure) will not use this, just because I'm left with no choice.
I already regret for this reply, since all "pool related" replies just have to be left without response.
I encourage georgem to put a link in the OP with detailed SPR pool discussion.