I would like to bind the Menu key, which is sort of like right click, but for the currently focused thing regardless of where the mouse is (so you can navigate around with arrow keys and use it to get to the same menu that right clicking would get you). I didn't see it among the options. I am trying to set up custom bindings for using OBS with a gamepad and I thought it would be nice for accessing stuff like Transitions and Filters while moving around with the arrow keys instead of using the joystick mouse. I confirmed with a keyboard plugged in that it works how I want, I just don't know how to bind that key to a button on my controller.

Maybe you could shove it in the Numpad section with the other special keys.