A couple of years ago I saw a set of replacement quick-release skewers for sale in a shop. They were made with a removable lever (I think that it might have been essentially a torque wrench matching a torque bolt-head in the skewer itself). The idea was that they made your wheels theft-resistant, since the thief would have to have a matching wrench to open the skewer.
I saw what looked like one on a bike today. My curiosity is newly piqued.
Anyone ever tried them? Results?