H 125 MSFS - Configuring the joysticks

Good morning. First of all I would like to congratulate the Cowan for the excellent job with the Cowan H125, which I recently purchased.
I managed to get almost all of the simulator switches and buttons on my collective and cyclic. However, there are two that I can’t find in the MSFS options: The “horn” and the “idle control (Twist Grip)”. It’s hard to start an autorotation having to take my hands off the controls!
Does anyone know how I can control these features from my physical controls? Where are they in the MSFS control options?