I just did it for the hell of it to see if it would work.  I had planned to map the rest of the body myself.  Animal templates are a pain to work with.

I also found that when exporting the Mil Cat OBJ, no head was listed to export so technically this would be a DAZ problem, not FSP.  The product listing says any figure so I thought it would work.  Obviously not.  I also think that in the next version, when importing an Object the program should show a relatively close image of the figure being imported--if that makes any sense.  For instance, you are always working with the same face and there are differences among all of the figures being imported.  This may be the reason why the maps don't always line up. 

Just curious... What woudl happen if you exported the whole body, used it a TempMan, zoomed in to work on the head and then exported the new morph out again.
If it has the same number of verices, it could still work as a morph target...
Laslo