I forgot about the minimum payout, Haha, plans foiled! Oh well you thought of everything...
Yes, that specific "share already solved" logic is pretty trivial to adjust as a quickfix. The caveat that makes it a little more than a quickfix is that it would have to only accept solutions with a different private key than any already submitted by the miner for the share, as otherwise you can solve one share and then abuse the fact that you know the solution to that share already to basically "print" shares Smiley. Still, should be possible to do while the longer-term solution gets built.
I don't see any problems then, its actually working quite well now, minus a slow miner being rewarded the same as a fast miner.
Possible to generate a getWork specific to a workername? like:
oclvanityminer -u
https://bitcoin-apps.appspot.com/mining/worker1 -a BTCADD
maybe use btc payout address twice vs worker name so it will be unique
it avoids using ip addresses, and theres no reason for the getWork files to pile up, if you delete them every few hours they should regenerate as users come back to mine vanity