Ya it's a weird thing, and I've played multiple betas now where the keybinds are messed up. Anyways I know what you mean by the two columns, and I've tried that. To give a little more detail I'm trying to bind Crouch (Hold) to one of the buttons on the side of my mouse. When I try just changing the default key which is L CTRL, it won't let me change it to a mouse button but it'll let me change it to anything on my keyboard. Then if I go to the right column it will let me add the bind to my mouse button, but that mouse button is already a secondary button for one of the gadgets. So even if I add the bind to crouch it doesn't remove it from the gadget, so if I then crouch in game using the mouse button I want to use it crouches, but also pulls the gadget out at the same time. Just seeing if anyone else is having the same issue, and giving the devs feedback, it should be a simple fix for them.