code: function( event )
  	{
  		if ( this.mode != 'wysiwyg' )
  			return;
  
  		switch ( event.data.keyCode )
  		{
  			// Paste
  			case CKEDITOR.CTRL + 86 :		// CTRL+V
  			case CKEDITOR.SHIFT + 45 :		// SHIFT+INS
  
  				var body = this.document.getBody();
  
  				// Simulate 'beforepaste' event for all none-IEs.
  				if ( !CKEDITOR.env.ie && body.fire( 'beforepaste' ) )
  					event.cancel();
  				// Simulate 'paste' event for Opera/Firefox2.
  				else if ( CKEDITOR.env.opera
  						 || CKEDITOR.env.gecko && CKEDITOR.env.version < 10900 )
  					body.fire( 'paste' );
  				return;
  
  			// Cut
  			case CKEDITOR.CTRL + 88 :		// CTRL+X
  			case CKEDITOR.SHIFT + 46 :		// SHIFT+DEL
  
  				// Save Undo snapshot.
  				var editor = this;
  				this.fire( 'saveSnapshot' );		// Save before paste
  				setTimeout( function()
  					{
  						editor.fire( 'saveSnapshot' );		// Save after paste
  					}, 0 );
  		}
  	}
docs: Listens for some clipboard related keystrokes, so they get customized.