Grouped DataTables: Can I dynamically pass in the number of columns?

I use DataTables all through our site and really look the grouped tables.  Is there a way to dynamically pass in the number of columns?  I have several instances used that all I do is change the number of columns.  It would be nice to be able to use it globally.

$('table.groupedtable').DataTable({
            "aaSorting": [],
            "pageLength": 1000,
            "columnDefs": [
                { "visible": false, "targets": 1 }
            ],
            "drawCallback": function (settings) {
                var api = this.api();
                var rows = api.rows({ page: 'current' }).nodes();
                var last = null;
                api.column(1, { page: 'current' }).data().each(function (group, i) {
                    if (last !== group) {
                        $(rows).eq(i).before(
                            '<tr class="group"><td colspan="5">' + group + '</td></tr>'
                        );
                        last = group;
                    }
                })
            }
        });