Tiny Editor script, to create empty game object as a child to currently selected transform.

Fast add child gameObject

using UnityEngine;
using UnityEditor;

public class CreateEmptyChild : MonoBehaviour {
	[MenuItem("GameObject/Create Empty Child &#n")]
	static void EmptyChild(){
		GameObject go = new GameObject("Empty");
		go.transform.parent = Selection.activeTransform;
		go.transform.localPosition = Vector3.zero;
		go.transform.localRotation = Quaternion.identity;
		go.transform.localScale = Vector3.one;
	}
}