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Ok. This took a lot of trial and error, but I got the pose editor to work for me. It is about as far from "user friendly" as you can get without being straight coding.
There are two tricks that make MOST of it manageable. First, when you start out, always click the blank page icon at the top left of the editor window to make a new pose. Select how ever many models you want in the pose. This is important to do first, because you can't add more later without reverting the scene to the default pose. The second trick is that all the "pose" field values don't have sliders. Instead, they have manipulators that for some reason have to be manually set every time you want to adjust them. To do this, right click on the word "translation" or "rotation" next to the bit you're trying to move. After that, it's all pretty self-explanatory, especially if you've ever worked with poser or Daz in any depth.
Here are links to a couple of tutorial videos I found that might help you guys:
The guy who made them is kind of derpy and moves at the speed of molasses on a cold day, but you should be able to figure out the basics from those two videos. He even goes into an explanation of the animation feature.
After playing around with it for a few hours, I managed to get a couple of decent animated poses out of it, and tried them out in the game. Any poses you save will show up at the end of the list in the poses folder in the game.
The only thing I had a real problem with was trying to rotate a model. For some reason, the feet and hands have independent anchors to the hip, so you have to manually un-twist the entire model once you get the hip translated to your preferred alignment. If anyone has tips on making THAT easier, I'm all ears.
I'll probably post a poses pack once I make a few more, because if any of you have tried using standard poses with heavily inflated models, you are aware how awful it tends to look. My poses will likely all be plus-size friendly. ^_^