The SDK does not allow file access outside of a defined area. This cannot be controlled at all by any developer. Main reason seems to be the Xbox support.
There you find the folder where the throttle settings are stored:
I understand that it’s currently not nice, but don’t forget the the custom FBW is not in the master for reasons.
I think it’s also important to note that it’s currently only the fly-by-wire but not a custom AP.
