Gesture Wellformedness

I am running an experiment on the acceptability of variation in sign language. One of the things that touch upon this matter is sign wellformedness, which supposes a certain sign language phonology with rules that tell whether a sign is wellformed or not. I am not done thinking that one over but it did get me thinking: is there such a thing a gesture wellformedness. According to these guys, there definitely is a way to do a gesture and a way that you don't do it. Listen to the comments for details :-)