Adsense YPN auto rotation with optimization

It seems as though I almost need to hire a full time manager to monitor the CPM value of some of my major sites Then switch accourding to what is paying out the best. Especially when the difference could be thousands per day. Yahoo and Google are pretty close CPM wise for me on average but some channels will see huge spikes either way on certain days or certain times. I was contemplating writing a tool that would log in to my adsense account and ypn accounts automatically say.... once a hour, check the cpm value and then adjust the rotation weight per channel based on what is paying more at the time. I think it would be fairly simple to write but what about the TOS.... I am going to have to talk to my adsense and yahoo reps and get there take if this would be acceptable. This would sure be a nice serverside tool imo as a publisher you would always get the highest payout.