I just did some tests with it shrunk small, and it works OK if you use the dials or if you make small movements with the mouse using the Translate/Move tool. But if you grab the end and drag a lot it can get pretty weird looking pretty fast. I think it has something to do with the way Poser rounds numbers when they are very small. It doesn't use enough decimal places in it's numbers to maintain accuracy. So use the dials and you'll be fine when it's scaled down to the size of a thread/string.