Apologies for the slow response! We definitely need to get a manual out there, but right now settings are changing quite often so it would quickly become absolute (half the settings you asked about here are brand-new).
Fast VR Frame-Swap - This changes how the system displays frames, it's kind of technical. Basically if it works for you, you should use it (slight FPS improvement), and if not it'll be automatically disabled. So don't worry about this one
Cull hidden headset pixels - Blacks out the edges of the screen on Vive/SteamVR. Saves a little bit of performance, and you can't really tell inside the headset. That said, definitely turn off for video recording, demonstrations, etc, where people will be looking at the screen.
Use single pass rendering - Draws both eyes with one draw call, helps on CPU usage. Turns off automatically on Win7 where it isn't supported. In general you want to leave this one on unless you're hitting really weird glitches.
Use rotational yoke - When grabbing the aircraft yoke using Oculus Touch / Vive wands, it will respond to both sliding your controller left/right forwards/backwards. It will also respond to you pitching/rolling your controller. This doesn't align perfectly with the yoke motion, but makes it very easy to control the aircraft with precision
Use positional yoke - When grabbing aircraft yoke using Oculus Touch / Vive, the yoke precisely tracks the aircraft's yoke animation using your controller. It feels more like you are actually grabbing it, but can be a little bit harder to control. Comes down to preference
Enable haptics - Controllers vibrate a little as you grab switches/levers and move them. Helps you "feel" the cockpit
Enable Yoke Haptics - This feature is currently un-implemented so the checkbox won't do anything, but it'll be to turn on little vibrations as you move the yoke.
Thanks,
Dan