I wrote a program to send vive controller locations to vJoy, a virtual joystick driver. It allows using the controllers to emulate a joystick. In the video I'm flying Aerofly FS2 using just my controllers!
When the grip button is held, the controller acts like a joystick or flightstick. So much more immersive.
Note that I hold the controllers near the actual flightstick or throttle only cause my brain like it that way. Just moving the controllers anywhere in space is enough to steer.
The program is available here for anyone who wants to give it try.