Lolz. Its about time Sir. Just confirmed from a Retired Group Captain who happens to be my uncle [Currently at SPS-11 post, serving in AWC, Wah Cantt]
He READ the whole discussion literally and was laughing at certain posts especially of your's sir [VCheng]
There are two confusions which are currently making everyone go crazy.
The first one is regarding "codes" which are required to "navigate" the F-16. Its a total nonsense that we need to beg US for them or they hold any significance in F-16s operational procedures, the whole program is designed as a package which can install and execute different maps and navigational plugins. There is a long list of some sort of "codes" which are transferred to PAF and PAF itself regenerates those [codes] afterwards according to the mission planning softwares supplied to us by Lockheed Martin. And let me add, US cannot create any malfunctioning in those codes. 
The second one is regarding "kill switches". Again a nonsense spread by some Anti-American sentiments present in our circle. If there was even a little truth in this BS then PAF wouldn't be spoiling its $5 Billion in this deal.
Last but not the least, US doesn't need to do all this hard work, their hardware is enough to jam our F-16s [ie. Digital Radio Frequency Monitor (DRFM]. So Sir, you shouldn't worry about the "mother ship" getting attacked or facing threat from our handful of F-16s which US is thinking of retiring sooner or later. 