I hate to second guess but here are my thoughts for what they are worth...

If you are cutting up the body could you put the cut/seams where they would appear with clothes on the body... e.g. cut the feet off where the socks would fall on the shin, the hands on the wrist where a long sleeve shirt cuff would fall, on the neck where a collar would be, if you cut the trunck do it where the tan line of a bikini or bra top would be... this would hide the transitions where actual people have color shift due to tan lines and other skin variation and if these cuts were matched in the grouping would make second skin texture and "dimensionalizing" morphs easier.

You could even cut out the whole bikini area rationally rather than just the vulva since most women who are not proffesional strippers or prostitutes have much paler bikini areas and buttocks than their overal skin tone regardles as to how dark or light that is.

It would be great to have the grouping and texture mapping agree for what used to be called sub-division... second skins can be applied with cuff morphs falling on the map division. The best clothing textures I have seen are mapped like actual dress patterns, imagine a body map cut that way? One last thought... could grouping out the palms and soles of the feet make procedural textures for dark complexions easier allowing something like a darker African texture with light skin areas?

One last mesh suggestion/comment... I would prefer rounded feet, toes, and fingers with a compression morph to flatten them over the standered flattened feet which are difficult to morph up for when say the bottom of the feet are visible in a pose.

Finally, my preference is for as few maps as possible... one for the body even if it is cut up, one for the eyes, and one for the face and inner mouth. I hate having to remember which head parts are actually on the body map etc... so I would love one map for all head detail and another for body including nail and finally one for the eyes.

Just MHO :)