Fixed-wing Attitude Controller for VTOL Aircraft

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Thank you very much for your reply.
In the script below, it says “/* add in manual rudder control in manual modes */”.
So, does it also apply to stabilized mode?

PX4/PX4-Autopilot/blob/f0dde453032b3bf40e7c7f90e766054f385d5258/src/modules/fw_att_control/FixedwingAttitudeControl.cpp#L552

I have another question for multicopter stabilized mode in the post below.
If you are familiar with the issue and can answer to my question, that would be much appreciated.

How is the yaw angle setpoint established for Multicopter Stabilized mode

Hello All, In the multicopter stabilized mode, the yaw stick controls the rate of rotation. (Source: https://docs.px4.io/v1.9.0/en/flight_modes/manual_stabilized_mc.html) However, looking at the flight log data, when the yaw stick is at the center, the yaw angle setpoint and yaw angular rate changes. So, I have questions below. Question 1: How is the yaw angle setpoint established? Question 2: How come does the yaw angular rate change when the yaw stick is at the center?