I like this idea as well, and think it would be fairly simple to implement. For example, if you put a conductive pad (Copper Tape, or something similar) on the tip of the thumb, and run that to your grounding wire, you could place 4 other conductive pads along the side of the index finger to represent each of the 4 directions similar to your posted image. One on each of the Knuckles, and at the tip of the finger. When you create a fist, the thumb could then easily touch the 4 separate pads to create the circuit. Then it is a matter of putting everything on a glove, connecting wires to everything and to the Makey Makey! I love you idea, it is simple and useful!