I did.

Actually a few years ago already.

Problem #1:

There is hardly a benefit, as Kids4 are rigged almost perfectly for a falloff sphere rigged figure.

Granted, the crotch area IS much better in my WM version, but it only really shows with extreme poses like a full split or bend.

(Blue: Original Kids4 - Green: Kids4 Weightmapped)

Problem #2:

Weightmapping involves a lot of smoothing.

Due to the Gen4's uneven mesh topology, smoothing the crotch area inadvertedly creates a very slight crease and a small bulge that might appear "genitial-like" in the right light.

A "decency" JCM can fix this, but it of course defeats the purpose of the weightmapping: Better posing without additional JCMs needed.

Yes, I weightmapped the Kids4 meshes like I did with V3, D3 and M4LOD, but in this day and age I definitely won't distribute what to an ill willed person might appear as an "anatomical correct" underaged figure, even if said "anatomical correctness" is the unintentional result of the limiations of Posers weightmapping tools.

Too much drama in the world for my taste already.

Still it's a shame, as this little endavour again showed me that Poser's weightmapping is just as capeable as Studio's.

We would just need a high quality mesh of our own to realize its full potential.