Q keybind changes camera mode but isn't mentioned in the controls.
Once you go into the controls page while in arena mode you can't close it so you are stuck seeing the controls until you die.
The old filter shouldn't be the default. The colors make the game feel much more alive and vibrant. I personally dont like the old filter at all but if you want to keep it add a comparison on start up and make the player choose, otherwise they won't know unless they go into settings. Also you should totally add the option to dual wield tommy guns