Touchscreen devices are getting more sophisticated all the time. Most touchscreen devices only report x/y position of finger touches. Qeexo’s FingerAngle is a touchscreen technology that tracks your finger’s 3D angle, allowing to create more sophisticated controls. As the below video shows, this technology can be used to create twist-sensitive controls:
This technology would enable you to interact with games and apps in a whole new way. You can find out more information here.