jQuery Grid Plugin - jqGrid

Or, without having to modify grid.base:

 
add to options:

    gridComplete: function() {
        $(".cbox").shiftSelect();
    },

add elsewhere:

jQuery.fn.shiftSelect = function() {
    var checkboxes = this;
    var lastSelected;
    var executing = false;
    jQuery(this).click( function(event) {
        
        if (executing)
            return;
            
        if ( !lastSelected ) {
            lastSelected = this;
            return;
        }
    
        if ( event.shiftKey ) {
            var selIndex = checkboxes.index(this);
            var lastIndex = checkboxes.index(lastSelected);
            /*
             * if you find the "select/unselect" behavior unseemly,
             * remove this assignment and replace 'checkValue'
             * with 'true' below.
             */
            var checkValue = lastSelected.checked;
            if ( selIndex == lastIndex ) {
                return true;
            }
            executing = true;
            var end = Math.max(selIndex,lastIndex);
            var start = Math.min(selIndex,lastIndex);
            for(i=start;i<=end;i++) {
                if (checkboxes[i].checked != checkValue)
                    $(checkboxes[i]).click();
            }
            executing = false;
        }
        lastSelected = this;
    });
}

shiftSelect lifted from: http://clownsinmycoffee.net/20.....th-jquery/

I was wondering what the maintainer's position on this was. I would like this behavior as well in jqGrid. Hopefully, it could use jQuery's selectable module instead of using its own custom implementation.