Isn't it impossible to successfully focus-stack images of a live animal?! These bugs are dead, aren't they? You're a monster!
Once again, no! I do not immobilize or physically restrict the movement of my subjects in any way. If it's an option I always try to photograph subjects in their natural environment (or at least outside), but occasionally I will bring an arthropod indoors to photograph (usually Salticids as they can disappear if not watched).