Never say never. jqGrid uses the jQueryUI collation class to execute the drag-n-drop function of a column. http://jqueryui.com/demos/sortable/
To remove a column from the list of sorted columns, run these two commands after rendering your grid (using sortable: true).
$('tr.ui-jqgrid-labels').sortable({ cancel: 'th:#element_id'});
$('tr.ui-jqgrid-labels').sortable({ items: "th:not(#element_id)" });
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