Some expected key-bind features are not working

Mouse4, Mouse5, etc cannot be bound.
When you are in the process of binding a key, the game says 'hit ESC to cancel'. If you hit ESC, you bind that action to the ESC key.
Some keys are bound with a 'Double' press, for example double tap Q to toggle lean left. If you attempt to rebind any key to double, it accepts the first key-press and binds to it (for example hit 'RR' it accept it as 'R' instead of 'Double R')
You cant unbind a key if it already has a default keybind (Hitting 'delete' or 'escape' binds the action to 'DEL' or 'ESC' respectively)