Can we update an new parameter using fnFilter?

I have add a new param using :

$(document).ready(function() {
        oTable = $('#mytable').dataTable( {
        // Ajax / Server Side
            "bProcessing": true,
            "bServerSide": true,
            "sAjaxSource": "/server_processing.php",
            "fnServerParams" : function (aoData) {
                aoData.push({
                    "name": "isStatus",
                    "value":""
                })
            },
        });

And I wan't to update the value of "isStatus" . It should take the value of checked checkbox … is this possible?