I think this is a fantastic idea! Im not understanding the biting bit, but ive never done that so thatll be why it doesnt appeal to me. I like the roller ball/click part though, and the fact it flexes. I think i respond more to the click part of it. I used to keep an Oasis drink bottle cap because it clicked, and it was good to fiddle with.
Keep up the research, fantastic to have ideas like this floating around!!