add classic left-click orders

OpenRA.Game/GameRules/Settings.cs

@@ -1,6 +1,6 @@
 #region Copyright & License Information
 /*
- * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * Copyright 2007-2013 The OpenRA Developers (see AUTHORS)
  * This file is part of OpenRA, which is free software. It is made
  * available to you under the terms of the GNU General Public License
  * as published by the Free Software Foundation. For more information,
@@ -112,6 +112,8 @@ namespace OpenRA.GameRules
 		public MouseScrollType MouseScroll = MouseScrollType.Standard;
 		public float ViewportEdgeScrollStep = 10f;
 
+		public bool UseClassicMouseStyle = false;
+
 		// Internal game settings
 		public int Timestep = 40;