I'm not from the selected region of Google for KitKat 4.4.4 r2. So if i update my Hammerhead illegally to 4.4.4 r2 (KTU84Q) will i get any problem in future?
One of the things that release 2 changes is the radio image, for specific carriers like Telstra Australia and 2degrees New Zealand. It might improve your mobile phone's signal even if you do not use those service providers; or, it might make it worse.