Mind you, if our reg. numbers don't have to be visible (ie in the battery tray), there won't be a number to look up. I don't know about everyone else, but if you broke into my house there would be more of interest than my drone.
This would probably be opening a can of worms*, but I'd love to be able to security lock our UAV's. Something along the line of what is done with Apple iOS -- password protected and a "find my drone" feature in the event of theft. Since these machines best with cellular enabled tablets, it doesn't sound too far fetched.
M
*I'm involved in the wireless industry, and "cloud-locked" phones are an industry wide headache. They do make theft less attractive, but legitimate owners frequently forget their passwords, effectively bricking their phones.