payout according to last round shares, and send immediately to your wallet (like p2pool)
different chain-length share value (see
http://rpool.net/reward)
Nice. Please note there is a 0.01 minimum value protocol requirement for each transaction output. This discourages dust so it could cause scalability barrier for this type of practice on block chain.
Edit: Ah I see now that sub 0.01 payments are delayed and accounted for by the pool. So there is no scalability limit to thousands of users.