Sorry - long message - I'll try to explain why I think it would be useful (please feel free to disagree) :
Firstly - for the armour
models (i.e. coat, armour etc) - yes, you're right - they just need stretching over the different bodies, and keep the same texture. They don't need the UVs adjusting at all. That's fine the way we're doing it already.
I'm referring to the texture
underneath on the base model - the legs, shirt, sleeves or anything else which isn't covered by the armour model, this is what I'm trying to make easier.
They're all made by moving parts around from the same original model - so all the vertices on the UV map can be lined up as with the original model. As I said, it might not need doing so much for the supermutant, as the supermutant armours and textures are likely to be considerably different from those worn by normal sized humans - but still, it would be much easier to use an existing texture as a starting point to work from, rather than painting an entirely new texture from nothing.
For example, if you pick the "human in underpants" texture, tint the skin green, adjust the face, add extra highlight to the muscles, then apply the skin patterning which is shown a few posts above, then you have a supermutant base texture. If the supermutant needs to wear trousers or a vest, you can copy one from a human model, paste it on, then adjust it until it's right. If at some point in the future, people want a wider range of armours for the supermutant, this can be done quickly by adjusting existing textures, rather than painting an entirely new texture every time.
These are the textures for the male and female suit underclothes :
The red braces on the shirt needed to be moved, the highlighting needed to be changed on the arms, legs and torso, but the majority of the texture was copied across from the male suit and the base female texture.
Further to this, I've adjusted the UV maps of the dwarf and fat man so far (they're just waiting to be checked by the 3D experts before posting & uploading), so they line up with the original human. This means that half of these human textures can easily be transferred to the other models, with no extra work. I plan on doing the same for the junkie, strong man, ghoul etc. Some of them need adjusting slightly (i.e. red braces on suit model on fat man) - but with no more work than making the female version. When someone paints the blue overalls for the dwarf, we can quickly have blue overalls for all other human types, and when someone paints Vic's clothes for the fat man, we can quickly have the same clothes for the others.
If we then produce all the variations in armour shape like this :
Then we have a full set of armours for all types.
As said previously, perhaps the supermutant is exempt from this, because of wearing different armours and clothing to the other models, but I still think it would make things much easier than completely redrawing several copies of the same texture, so it fitted the completely different UV maps as below i.e drawing every shirt, face, leg, arm etc etc in 7 different positions, in 7 different shapes :
So, though it's not essential, if we do the same with the supermutant texture, we can copy brown supermutant trousers to the other humans, or copy blue jeans to the supermutant, or copy vest / shirts / armour underclothes between them etc etc. They would probably need small changes to fit properly, but this would still be much less work than manually drawing every single one.
Anyway, hope that all made sense. If you agree that it would be useful, I can try and redo the supermutant UV next (unless you want to do it), so you can produce the base skin texture for him. If you're sure it wouldn't be of any use for this to be done, then I'll miss the supermutant out and just do the humans and ghoul.