This came up a while back in an unrelated thread, which I can't find any more (of course).
Is there a way to change Zbrush's default behaviour when sculpting on open edges? For example, you make an apron accessory for a character which is simply single-sided polygons without a thickness. I find that when I hit the open borders with the standard brush, for example, it kind of "pins" the edge in place. I then have to follow up with a lot of move tool nudging. Any ideas to get around this? I'm sure someone mentioned something about this before.