I like this concept, but does anyone have ideas on how to pull it off?
Most people store their U-Lock stuck in a rear rack or bag.
Mine's mounted on my frame, but even so I don't think I could pull it out in time since I'd have to reach down and unstrap the velcro. Plus I'd be having to do this with my off(left) hand, as the stronger one is busy with steering... I'd also not think too highly of my chances of aiming the throw at speed...

Really, how would you do it?