Shooting raw doesn't consume any extra time . . . If you're using Lightroom or Aperture - you can just make more adjustments to the RAW files, but you don't have to.
Sure, they take up more space, but that's hardly a deal breaker with today's big drives.
Perhaps you should try shooting RAW . . . . . I've been shooting jpg with my E-P3 so far, because their is no Aperture support yet. It doesn't save me any time, but it sure does reduce the options for PP.
Try it - you'll buy it!