Oh, sure. It's to set the joint parameters when you make a new item of clothing for a figure. Setting joint parameters is really slow and tedious, and until it's done the clothing figure has a tendency to jump up in the air or wad up into a ball or something weird when it's conformed. This sets them all in one go. They might need some tweaking depending on how the outfit is shaped (loose stuff usually needs work), but even then there's a good starting place established and a lot of the hard work is done. I've also downloaded a few things where the JPs were just completely wrong, like a boot that, when conformed, had the heel going through the shin. The QCs won't help with just pokage, but a lot of times they'll fix really blatant problems like that.