It's minimized with Google closure. Warnings don't corrupt.
The recommended way to patch is to write separate files to override the specific methods of pqGrid. For example if you wish to override some method "method1" of pqGrid, then use a separate file to write
(function($){
$.paramquery.pqGrid.prototype.method1 = function( params){
//new functionality here.
};
})(jQuery);
BTW which methods/functionality have you patched? You may post them ( the outline ) in "suggest new features" board, they might be included in pqgrid core if found useful.