@FlightEngineer1 yes, I'm aware of ai.cfg. I have used this to enable and tune (to an extent) autopilots in planes that don't have them natively, with mixed success but usually well enough to pass muster. This often also entails adding an autopilot electrical circuit to systems.cfg, and checking engines.cfg (why there?) to make sure that the param DisableAutopilotControls=0; sometimes a dev will explicitly set it to 1 and then no autopilot.
Maybe I'm just old and slightly bitter at this point, but I have no faith that Asobo will ever address this, are aware of it, or even know what they're doing in this regard. There are core algorithm parameters that were REQUIRED when I was doing industrial process control PIDs, which are utterly absent here. Which brings into question the form of the equation they are using. They're never going to expose the maths, and I have better things to do.