Maybe .01 % of your player base is playing on linux. But here I am.

Mouse+Keyboard

New to the game. Mouse attack and look are not working / doing anything. I went to the key bindings to try to figure it out.

The "Attack" action binding RMB in the input settings appears to be grayed out somewhat, and I cannot customize it. Interact is also RMB but not grayed out. I click on "Interact" RMB icon to try to change it, it visually changed the button text from the RMB glyph is " ... " but nothing I press (mouse or kb) changes it. "Reset" above resets it to the RMB glyph. Also, "Offhand Action" for the RMB glyph is grayed out. More clicking to customize the keybindings and it appears I cannot change anything.

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UPDATE

Okay, things were not working because I had a joystick and throttle (space flight) plugged in but stowed in the desk. It is odd to me that the game would disable mouse actions when a joystick is detected.

Still odd it wouldn't allow me to override bindings to kb/mouse with joystick detected.

I recommend also exposing an ini file that contains the bindings so that a user can edit them manually or save them

Okay, thank you for the information and your insights on Linux thus far! :)
You can it say also here directly, if you want: https://www.twitch.tv/entwicklerwg