John Farley told me that he dead sticked a Hawker Harrier at Edwards Airforce Base. He said the gliding approach speed was about 250 knots, but otherwise it was not difficult! I just keep thinking about those itty bitty wingtip wheels touching the runway at speeds like that!
The fact that a Mirage, Harrier, the Space Shuttle, or a lifting body can fly a gliding landing at high speeds and descent rates does not mean its certifiable that way in a civil aircraft! Hmmm, I wonder how the Concorde glided, I presume it had to for certification....