Okay, that was a bit disappointing.

My work flow was creating a list of 25 figures to test (I forgot that Genesis 2 doesn't import, so I only tested 23.)

I brought each figure into Poser 12, as that was stated to be working. With the figure active, I would scale it to 50% size, usually drop it to the floor, add a pose (no fat puns, please) by first selecting the figure's name as a subset of the items I wanted to store. (I did not select the figure's body, which may or may not be relevant.)  I then requested that it not save the graphs, the morphs channels, or body transformation only scaling.

After making 21 of these poses (I accidentally forgot to save two of them which I didn't realize until testing time), I then put each figure into poser and tried applying the pose.  The figure would then immediately bury itself waist-deep in the ground without any change in size.

Either something is wrong with my work process, or the scaling cannot be saved in a pose in Poser 12, ether.  I hope for enlightenment from someone wiser than myself, which is pretty much the entire population of Renderosity.