Special NSA user with root rights and a separate password for every installation (on every OS and platform), so that leaked credentials for one computer doesn't affect any other - creation of such a user can be done during online activation.Yes that requires that online activation should be secure process. I don't think this is genius idea, but it should be better than a backdoor in every OS that can be used with no credentials check.

As for query "all the cities with more than a million people, in frenchspeaking countries" - we are not there yet. But could it be submitted as city.country.legalLanguages ="French" city.population >= 1M - if yes, and you are fine with the fact that numerical values will only be from some "fact box" - then it could be done, I think even sort of auto-complete for users wouldn't be too hard to implement.