scale	Scale to modify.
position	The position of the handle.
rotation	The rotation of the handle.

Returns
Vector3 The new scale vector.

Note: Use HandleUtility.GetHandleSize where you might want to have constant screen-sized handles.

Make a Scene view scale handle.

This will behave like the built-in scale tool

Scale handle that will appear whenever you select the GameObject.

	// Creates a "Big" (5 times size) Scale handle that will be present whenever
	// you select the target Game Object
	
	@CustomEditor (ScaleAtPoint)
	class ScaleHandleJS extends Editor {
		function OnSceneGUI () {
	        target.sc = Handles.ScaleHandle (target.sc, 
	    					target.transform.position,
	    					target.transform.rotation,
	    					5.0);
	        Debug.Log(target.sc);
	        if (GUI.changed)
	            EditorUtility.SetDirty (target);
	    }
	}

And the script Attached to this Handle:

	// ScaleAtPoint.js
	// Usage: Place this script on the Game Object you want to use the
	// editor-created scale handle.
	
	@script ExecuteInEditMode()
	
	var sc : Vector3 = Vector3(1,1,1);
	
	function Update () {
		transform.localScale = sc;
	}