And a different point of view...
Since:
1) I primarily shoot RAW, and
2) as already pointed out, the color matrix chosen only applies to the in-camera jpegs, and
3) when I shoot jpegs it is usually because I only want snapshots to email or post on the web
I prefer to leave the color matrix set to the skintone sRGB setting since this usually allows me to post/email the images with very little adjustment after the fact.
IF you choose to use Adobe RGB, then you will need to convert the profile before emailing or posting, lest the image appear "flat" onscreen.
Cheers,
Jack