from Maya Help:
By default Fur uses UV set map1, but you can link your fur descriptions to different UV sets on your polygonal surface. For example, if you have different UV sets defined for different projections, you can link the fur descriptions to the UV set that gives the best fur result.
When you link a fur description to a UV set, all the fur descriptions attached to the polygon are linked. You cannot link individual fur descriptions to different UV sets.
WHY NOT ? whats the point if you can't have different fur descriptions attached to different UV sets on the same pieceof geometry ?