Note : AFAIK 3D-Coat read the mesh as expected, the split in different maps is a choice made by DAZ but in the object they are only the materials zones
I use Miki2 in 3D-Coat but this is for drawing low-res clothes with the retopology tools for further work in Silo or C4D, since Miki2 is used only as reference i have a special version of the object with one material zone and selected 512 for the size.
IMO you must make a special object for using in 3D-Coat, you must merge together the materials who are in the same map, for V4 all materials starting with 1_ are in the first map so they must be merged etc... in the end you must have an object with 7 material zone correspondind to the 7 maps
You can merge materials in UVMapper
You can delete the unwanted geometries to make the mesh lighter, eyes, lashs, innermouth, teeth, deleting can be done in UVMapper too
In the end you probably have several special objects stripped down for a particular task, if you want to work on a face displacement map you don't need to import the legs and toes etc...
For the other settings i don't know, i plan to use the paint tools somewhere in 2009
Jean-Jacques Roh