A "Heads Up Display". Nothing close to being VR or 3D but something that interacts with Fps and only goes over one eye (I.E. the scanner from Dragon Ball z). Think: Metroid Prime 3.0. You'd haver the analog in one hand the freestyle in another and a small (wireless?) text and graph display for health, ammo and things of the such. The beauty of this is they don't cost that much to make ( A battery, 2-inch fiber optic cord, a blue LED and some clear plastic) I believe it would add another level to the experience.