I wonder if this issue has been resolved as of March 2023.
Just in case, I asked an AI named ChatGPT about it. my question was
is it possible to connect two USB joystick with mission planner?
does mission planner recognize all two joysticks at once?
is it possible that one joystick controll pitch, roll, yaw. and another joystick control throttle?
and received a very confident answer that it is possible.
However, some say that ChatGPT’s answer is not yet entirely reliable. I would appreciate it if there is someone who can answer more confidently than ChatGPT whether it is possible or not.