Quickstart for the P3Dv4 default F-16... Press SHIFT-1, and select ready to fly. Boom.
Speedbrakes for the P3Dv4 default F-16... if you press and HOLD the standard speedbrake toggle key (usually "/"), it will appear to open them up. It's almost as if the F-16 doesn't respect the fact you've toggled them open, because they close immediately. If you hold the key down, it appears that you can force the issue... but you need to keep holding the key, or else they'll close right down again. It makes me think there is an axis assigned to them which is in a closed position, but I can't quite figure it out.