Kinda unstable plane with some fly-by-wire. Capable of Cobra, Kulbit and high-AoA turns
WARNING: a bit of realistic flight model - as the speed increases the agility reduces. For the max agility fly at 450-500 mph

AG1: Auto levelling
AG3: combat mode (speed limited to the optimal for maximum maneuverability, thrust vectoring enables)
On ground: pitch up to travel, yaw to turn
Flaps are automatic

XML:
Canards:
(Trim / 10) - (-0.325) * clamp01(TAS<150) - (AngleOfAttack/90) * clamp01(TAS>10)
Elevators:
(Pitch/1.5) * exp(-pow(0.005*TAS-0.75,2)) - (PitchRate/TAS/2) + (Roll / 10)
Thrusts:
clamp(Roll/2 + Pitch + Yaw/2, -1, 1) * clamp01(Activate3)
Engines:
Throttle * clamp01(0.1 + TAS/100) + (clamp01(Pitch) / 50 *(1 - clamp01(TAS - 15)))

System is compatible with literally any plane. If you don't have canards and your airplane is pitching up uncontrollably, then write "+ (-0.325) * clamp01(TAS<150)" into your elevators

All numbers are needed to be changed to suit your plane