lets take M4 as an example. you have 3 textures.

-torso

-limbs

-head

 

so if you want to use all textures you need at least 3 material groups. because UV's are overlaped.

so in blender or any other 3D software you can move UV's in 2D space.so for example if you move the UV's to the right then some programs can read every UV with only one group.

 

so i was thinking that i would offset the UV's  up and right. and then i would use poser to offset the textures.

 

now the question is if poser would be able to do this