When using airlink, the game itself is running on the PC, so anything connected to the PC is potentially available. Steering wheels and joysticks should all work fine, assuming the game supports them (you wouldn't be able to play beat saber with a joystick, but you could play elite dangerous, x-plane, dcs, etc since they natively understand joysticks)
Yes, depends on the game and how much they support a hotas, or ffb wheel setup. That said it's kinda crappy, I often just go back to my 55 in 4k tv. Just because feeling for all the buttons I can't get used to it.
If the stick works on your PC it should work on any VR game on PC that supports it. I use HOTAS and wheel/pedal sets on various sims and they all work.
It's very unlikely to work on the headset itself, but anything via Airlink should be fine.
