If you have Poser 7 theres a simple way of converting a material collection to a mat pose. For your own use you can just get in the habit of using material collections instead.

Check freestuff for python scripts to write mat poses.

if you have a material collection mc6 file , rename it to a pz2 , move it to the poses library and edit it in wordpad and change the line mtlcollection to figure.