Has anyone run the CPU Miner for Bitcoin?

I assumes I have to setup something similar in the cc_config file like I did to get the RBoxes to work. As is, the CPU Miner WU's run and report fine; however, every one is invalid. I only want to run this since WUProp attached itself to this and I have 50 hours from when I first started running Bitcoin. It would be nice to get the credits.