Have you seen 'Premium Rush'? --see it!!! I'd enjoy an Automatic-lock device with no spinning around a metal post or something--and when some bastard steals your bike an auto-venom odor emits from your bike and stuns the thief! For a single speed hardtail, a switch that can automatically add a rear derraileur and adjusts the freewheels with ease to speed up on uphill terrains! That's hi-tech!!!