Well if you have seperate areas set up by using colors etc. You can then apply differnet materials to each even if it is UV mapped. That is what I do so I can have parts with procedurals and parts with painted some with painted with decals. You can eve change the type of mapping for those parts from Parametric to whatever.

The wit of a misplaced ex-patriot.
I cheated on my metaphysics exam by looking into the soul of the person next to me.