One of the bike trackers might help. It alerts if the bike is moved outside a small perimeter with the key off. The unit itself uses GPS combined with a cell phone using text messages. The nice thing is you don't have to even know it has been stolen as it alerts the tracking company and they call you. One stolen bike with a tracker led police here in Florida to a lot of other stolen bikes. The cost is several hundred bucks plus a monthly tracking fee.
The main purpose of them is so people (wife ?) can keep up with you on trips. They plot your course on Google maps or something similar.
Actually, in this case, by the time the guy could have run across the street, the bike would have been gone.
