THREE.Object3D.DefaultMatrixAutoUpdate

For performance, I end up setting matrixAutoUpdate to false for the majority of objects and manually trigger the update as needed. It would be great if this could be set this way globally.

src/core/Object3D.js

@@ -64,7 +64,7 @@ THREE.Object3D = function () {
 	this.matrix = new THREE.Matrix4();
 	this.matrixWorld = new THREE.Matrix4();
 
-	this.matrixAutoUpdate = true;
+	this.matrixAutoUpdate = THREE.Object3D.DefaultMatrixAutoUpdate;
 	this.matrixWorldNeedsUpdate = false;
 
 	this.visible = true;
@@ -80,6 +80,7 @@ THREE.Object3D = function () {
 };
 
 THREE.Object3D.DefaultUp = new THREE.Vector3( 0, 1, 0 );
+THREE.Object3D.DefaultMatrixAutoUpdate = true;
 
 THREE.Object3D.prototype = {