dojo - OpenLayers controls keyboard shortcuts

I'd like to hook up keyboard shortcuts to my map controls e.g. holding down 'z' will activate the zoombox tool etc. I can't seen anything relevent in the API for doing this. Is it easily done? My controls are sat beneath dojo toggle buttons and menu items like so:

// zoom tool
zoomBoxTool = new OpenLayers.Control.ZoomBox();
map.addControl(zoomBoxTool);

// zoom button
var zoomBoxButton = new dijit.form.ToggleButton({
    label : "Zoom",

    iconClass: "zoomIcon",
    showLabel : false,
    onChange : function(val) {
        toggleTool(val, zoomBoxTool, this)
    }
});