I’m a real world autogyro (and fixed wing) pilot. I love that Asobo/Microsoft have included a gyro in FS2024! The pre-rotator is used at the commencement of take-off; it connects the engine to the rotor to spin it up to around 200 rotor rpm. Once that speed is reached the pre-rotator is disconnected, the stick pulled full back and full power added. The forward motion of the gyro into the airflow then causes the rotor to accelerate (it is no longer connected to the engine once the pre-rotator is released) and it will become airborne somewhere around 280 RPM, depending on weight. It’s essential then to get the stick forward to fly level in ground effect until around 60 kts is achieved, when you can then climb away.
As to how it handles, I’m still having sim issues so cannot comment fairly at the moment. OK, is my opinion so far; the rotor RPM seems way more variable than it is in real life.
I too have have been unable so far to bind a key or joystick button to the pre-rotator.
And if you want to see some of my real-world videos, have a look on YouTube for ‘StuWithAView’.