add: case "cmd_shiftDelete": 
context:    supportsCommand: function(command)	{		switch ( command )		{			case "cmd_delete":			case "button_delete":			//case "cmd_selectAll": the folder pane currently only handles single selection			case "cmd_cut":			case "cmd_copy":			case "cmd_paste":				return true;							default:				return false;		}	},
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/3a9325ea08333aca10ee51ffe31928a42cc39e03/mail3PaneWindowCommands.js/buggy/mailnews/base/resources/content/mail3PaneWindowCommands.js