AxisAndOhs is an external application that replaces the controller (=yokes, joysticks, etc) logic in

• FSX Acceleration, FSX:SteamEdition
• P3D V2 - 3 - 4 - 5
• Microsoft Flight Simulator (2020)

The app supports native Windows USB Game Controller devices and MIDI devices.

Key features:

• Assign axis movement and simulator events to joystick axis or MIDI rotary encoders
• Assign any simulator event to joystick or MIDI buttons
• RPN scripting: by creating your own scripts, it is possible to trigger more complex functionality with a single button than is normally possible with native simulator events.
• Mouse controlled yoke, rudder, throttle or spoilers axis, with trim (in MSFS too)
• AxisAndOhs will also handle Saitek Multi, Radio and Switchpanels. Up to 3 Saitek Flight Instrument Panels ("FIP") can be used as well.
• The app includes a set of virtual flight instruments that you can drag anywhere on your desktop (for example to another screen) or view them using a web browser on any device (for example phone or tablet) that is connected to your LAN or WiFi.

PLEASE TRY THE DEMO VERSION FIRST, TO MAKE SURE THAT YOUR HARDWARE IS SUPPORTED! 
There will be no refunds, and there won't be any support for non-functional hardware. 
The DEMO version is available on the Lorby-SI website.