One easy way to add support for multiple input keys is to use Godot’s “actions”, https://docs.godotengine.org/en/stable/getting_started/first_3d_game/02.player_input.html#creating-input-actions . There you can for the same action add multiple input keys. For instance, if you have an action for moving horizontally, you could add “A” and “left arrow key” for negative input, and “D” and “right arrow key” for positive input. That may also decrease the need for adding support for input key rebinding.