AdWords CPM Ads: Controlling Ad Delivery

I'm looking for tools/tips on how to control, outside of manually pausing and unpausing campaigns, to throttle the ad delivery in AdWords CPM campaigns.

As I've experimented more and more with CPM campaigns through AdWords I've realized that the daily budget can easily be met by 6:00 or 7:00 am each day...which means I'm not getting impressions during the prime day hours. So far I've been pausing campaigns at about 10:00 pm, then reactivating them each morning at about 9:00. It's the only way I've been able to control the ad delivery a little better and get impressions during the day when my target audience is most active.

I think it's time for Google to make time of day advertising a standard option in the AdWords control panel. I know that's an option that MSN AdCenter has... If you have any helpful tips or tools for controlling CPM ad delivery please feel free to share.