Adds tiny icons to the Unity Editor Transform Inspector for quick and easy resetting position and scale

NewTransformInspector.cs

using UnityEngine;
using UnityEditor;

[CanEditMultipleObjects]
[CustomEditor(typeof(Transform), true)]
public class NewTransformInspector : Editor
{
        /// <summary>
        /// Draw the inspector widget.
        /// </summary>
        public override void OnInspectorGUI ()
        {
                Transform t = (Transform)target;

                float oldLabelWidth = EditorGUIUtility.labelWidth;
                EditorGUIUtility.labelWidth = 15;

                EditorGUILayout.BeginHorizontal();
                bool resetPos = GUILayout.Button("P", GUILayout.Width(20f));
                Vector3 position = EditorGUILayout.Vector3Field("", t.localPosition);
                EditorGUILayout.EndHorizontal();

                EditorGUILayout.BeginHorizontal();
                bool resetRot = GUILayout.Button("R", GUILayout.Width(20f));
                Vector3 eulerAngles = EditorGUILayout.Vector3Field("", t.localEulerAngles);
                EditorGUILayout.EndHorizontal();

                EditorGUILayout.BeginHorizontal();
                bool resetScale = GUILayout.Button("S", GUILayout.Width(20f));
                Vector3 scale = EditorGUILayout.Vector3Field("", t.localScale);
                EditorGUILayout.EndHorizontal();

                EditorGUIUtility.labelWidth = oldLabelWidth;

                if (resetPos) position = Vector3.zero;
                if (resetRot) eulerAngles = Vector3.zero;
                if (resetScale) scale = Vector3.one;

                if (GUI.changed)
                {
                        Undo.RecordObject(t, "Transform Change");

                        t.localPosition = FixIfNaN(position);
                        t.localEulerAngles = FixIfNaN(eulerAngles);
                        t.localScale = FixIfNaN(scale);
                }
        }

        private Vector3 FixIfNaN(Vector3 v)
        {
                if (float.IsNaN(v.x))
                {
                        v.x = 0;
                }
                if (float.IsNaN(v.y))
                {
                        v.y = 0;
                }
                if (float.IsNaN(v.z))
                {
                        v.z = 0;
                }
                return v;
        }

}