If you're using Poser 6 or 7, you can save a Material Collection direct to the Material Room.  It works in the same way as a MAT pose except you access them from the Material Room rather than the Pose Library.

Select your prop, then click the + at the bottom of the Materials library.  Select Material Collection from the dialog box, give it a filename and you're good to go.

BTW, no prop will respond to a MAT pose or Material Collection unless it's parented to something.  Nothing you can really do about that, it's just the way Poser works.

Coppula eam se non posit acceptera jocularum.

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