I'm not sure if this counts as 'unusual' or not, but I have an X-Arcade Tankstick [1], which includes a trackball (and two regular sticks plus buttons).
And although I don't own them, over at ultimarc they seem to sell a (USB) lightgun [2], and spinners [3] meant for use when building your own cabinet.
[1]
https://shop.xgaming.com/products/x-arc ... b-included
[2]
https://www.ultimarc.com/aimtrak.html
[3]
https://www.ultimarc.com/SpinTrak.html