Was thinking of what data structure I'd procedurally populate the Input manager for Unity, came up with the following. But interestingly I first tried using enum Directions instead simply containing Up, Down, Left, and Right, but when I got to making the nested dictionary I realized that wouldn't help, that each player needs a **different** set …

PlayerControl.cs

public class PlayerControl : MonoBehaviour {
  
  //...

	private class Directions{
		KeyCode Up;
		KeyCode Down;
		KeyCode Left;
		KeyCode Right;
	}

	private Dictionary<Players, KeyCode> mapKeyboard = new Dictionary<Players, Directions>(){
		{Players.player1, new Directions(KeyCode.W, KeyCode.S, KeyCode.A, KeyCode.D) },
		{Players.player2, new Directions(KeyCode.UpArrow, KeyCode.DownArrow, KeyCode.LeftArrow, KeyCode.RightArrow) },
		{Players.player3, new Directions(KeyCode.O, KeyCode.L, KeyCode.K, KeyCode.Colon) },
		{Players.player4, new Directions(KeyCode.Keypad8, KeyCode.Keypad2, KeyCode.Keypad4, KeyCode.Keypad6) }
	};
	
}