Now you just place a typical PPLNS framework on top of your node.  People register with a user name.  When they connect with that name, since it's not a BTC address, their hash rate gets added to the node's default address.  Now you have all of this hashing power on one address that is contributing to the share chain.  As soon as a block is found, that address is paid.  Then, you just divvy out the payment to the miners based on a standard PPLNS system.