All kills are PK in this Hurri vid as you could see before. This is not a privilege of tungsten only but of any AP ammo and aiming at the center of aircraft instead of wings (sharp at convergence range). A pilot is the softest part of an airplane.
http://youtu.be/ZczgdRRdGV8
I think it is possible to limit certain loadouts on server side via scripting if needed. MG just gave us a possibility to use different loadouts. Offline it is a responsibility of a mission-maker to include historic loadouts (this is the reason we can not change it offline). There is probably a way to do this online too, C# scripters know better.