If you'd like to use Stream Deck buttons to trigger FSUIPC functionality, you can use FSUIPC's native "virtual joystick", without the need for vJoy (which can create issues for certain games and devices), from this plugin: https://github.com/IslandJohn/StreamDeckFSUIPC. If there's interest, I can add triggering of offsets and controls directly, but I didn't see a need to move the UI for those things from FSUIPC.