I use a lot of stress positions in my Cruel World customs, but I'm a strong believer in motivating the young lady to move desperately within the limited range available to her while in the position. Variants of the spread-eagle position that leave her wide open and totally helpless are stressful both physically and emotionally, since she soon learns that much more than the stress of the position will be the stress of trying to get out of it. I'm much more a fan of singing and dancing in my torturettes than dislocation and maiming. Just a personal taste, I guess. And any position that doesn't allow for recreational breaks between tortures is serious frustration for me (and maybe even for her, which just adds to the humiliation.