There is absolutly no problem with scaling Poser figures in proportion, just select the body and turn the scale dial. The problemes come when you try to scale them out of proportion, and those seem to be big problems. From the very little bit of experience I have had doing this, I try to achive the general proportions with the scale dials, then un-hide the translation dials for some tweaking, then use morphs to try to fix what is still broken. The image is 3 Victorias, and two posettes one with fat and the other with thin scaling.