Update Project Settings > Input Map from EditorPlugin?

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You can add it like this:

@tool
extends EditorScript


func _run() -> void:
	# Create the input events
	var event_key = InputEventKey.new()
	event_key.physical_keycode = KEY_R

	var event_joypad = InputEventJoypadButton.new()
	event_joypad.button_index = JOY_BUTTON_X

	# Create the input dictionary
	var input = {
		"deadzone": 0.5,
		"events": [
			event_key,
			event_joypad
		]
	}

	# Set the input/<name_of_your_input_action> in the project settings
	ProjectSettings.set_setting('input/reload', input)
	# Save them
	ProjectSettings.save()
	# I've not found a way to update the project settings input map editor
	# but to restart the whole editor.
	#EditorInterface.restart_editor(true)

I’m using an EditorScript but the same can be done with a plugin.

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