autopilot should warn?
Safta's sim and Colgan 3407 both seem to involve the autopilots having the AC in extreme trim before stick shaker. Presumably the AP "knows" when it is having to going to extreme trim, is an opportunity for a warning being missed? What should the trim threshold be? Should it be selected at a point at which an attempt a full power recovery might increase the stall? Or are extreme trims too normal for warnings to be anything other than distracting?
A narrowly focused human pilot having to fly without throttle woiuld presumably speak up, "Hey, I'm having to go to extremis here, HELP!" The autopilot would seem to have all the info it needs to issue this kind of warning.