Mind reading one of your talents?
I was pondering the same thing last evening.
Since you reminded me by creating this thread I just took some test shots of the rough cedar wall above the fireplace with my K20D and DA*50-135, tripod mounted and using the cable release. All at 1/15s, f/2.8, ISO140. I took 3 consecutive shots each in AdobeRGB and sRGB. I used DNG file format since it is uncompressed.
As you can see below, each shot is slightly different in size, but there is no appreciable difference between the sRGB and AdobeRGB.
Code:
04/07/2009 04:40 PM 24,161,261 _JDG7710.DNG
04/07/2009 04:40 PM 24,182,907 _JDG7711.DNG
04/07/2009 04:40 PM 24,153,070 _JDG7712.DNG
04/07/2009 04:40 PM 24,185,385 JDG07713.DNG
04/07/2009 04:40 PM 24,148,729 JDG07714.DNG
04/07/2009 04:40 PM 24,153,295 JDG07715.DNG
This leads me to believe that, unless "space" is allocated regardless, there isn't any difference when shooting RAW and the setting only really applies for in-camera JPEG just like the megapixel and quality settings.
From the specs: "Color depth - 8 bits/channel JPG,
12 bits/channel RAW"