just as the title says, why not create a mode which involves real-time dancing? the thing should go like this: you should see a colored shadow on screen, doing a specific pose. when the time approaches, you do that pose. that should be the Hit Circle. when a shadow has some kind of tail, that means you should go along with it and with accuracy. that's the Slider. now for the Spinner, i think you should hold a pose or move your hips like you have a Hula Hoop. all this motion may require a webcam or an EyeToy, along with PSMove controls. instead of asking for dancers, why not being a dancer?