There is a lot of room for "bad form" in snowboardign as long as the very basics are taken care of. Weight centered and legs loose. The board doesn't care where your torso is. The reason that is taught as proper form is because until you learn to control your feet/legs then your torso will have an effect on what your feet/legs do. As you said it is a case of once you learn the rules you can break them. In fact almost all tricks require a breaking of the basic rules. Ruddering is bad unless your lining up for a trick and need to scrub speed with out making turns. Turning your torso is bad unless your trying to spin.
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