possible solution to openlayers shift-click-drag issue

example for changing OL key handlers

var map; 
function init() { 
                map = new OpenLayers.Map('map', 
                { 
                    'controls':[] 
                }); 
                var wms = new OpenLayers.Layer.WMS( 
                "OpenLayers WMS", 
                "http://vmap0.tiles.osgeo.org/wms/vmap0", 
                { 
                    layers: 'basic' 
                }); 
                map.addLayer(wms); 
                var navigation = new OpenLayers.Control.Navigation({'zoomBoxEnabled':false}); 
                map.addControl( navigation ); 
                map.zoomToMaxExtent(); 
                navigation.activate(); 
                navigation.dragPan.handler.keyMask = OpenLayers.Handler.MOD_SHIFT; 
}