Salve come da titolo vorrei utilizzare questo plugin , il tutto funziona il problema sono passare ulteriori parametri inseriti nei tag input :

codice:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>


<title>Plupload - jQuery UI Widget</title>


<link rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/themes/base/jquery-ui.css" type="text/css" />
<link rel="stylesheet" href="<?=base_url() ?>/assets/js/plupload/jquery.ui.plupload/css/jquery.ui.plupload.css" type="text/css" />


<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.2/jquery-ui.min.js"></script>


<!-- production -->
<script type="text/javascript" src="<?=base_url() ?>/assets/js/plupload/plupload.full.min.js"></script>
<script type="text/javascript" src="<?=base_url() ?>/assets/js/plupload/jquery.ui.plupload/jquery.ui.plupload.js"></script>


<!-- debug
<script type="text/javascript" src="../../js/moxie.js"></script>
<script type="text/javascript" src="../../js/plupload.dev.js"></script>
<script type="text/javascript" src="../../js/jquery.ui.plupload/jquery.ui.plupload.js"></script>
-->


</head>
<body style="font: 13px Verdana; background: #eee; color: #333">


<h1>jQuery UI Widget</h1>


<p>You can see this example with different themes on the <a href="http://plupload.com/example_jquery_ui.php">www.plupload.com</a> website.</p>


<form id="form" method="post" action="<?=base_url() ?>/user_esami/upload_file_esami">
  Nome<input type="text" id="nome">
  Cognome<input type="text" id="cognome">
  
  <div id="uploader">
    <p>Your browser doesn't have Flash, Silverlight or HTML5 support.</p>
  </div>
  <br />
  <input type="submit" value="Submit" />
</form>


<script type="text/javascript">
// Initialize the widget when the DOM is ready
$(function() {
  $("#uploader").plupload({
    // General settings
    runtimes : 'html5,flash,silverlight,html4',
    url : '<?=base_url() ?>/user_esami/upload_file_esami',


    // User can upload no more then 20 files in one go (sets multiple_queues to false)
    max_file_count: 20,
    
    chunk_size: '1mb',


    filters : {
      // Maximum file size
      max_file_size : '1000mb',
      // Specify what files to browse for
      mime_types: [
        {title : "Image files", extensions : "jpg,gif,png"},
        {title : "Zip files", extensions : "zip"}
      ]
    },


    // Rename files by clicking on their titles
    rename: false,
    
    // Sort files
    sortable: true,


    // Enable ability to drag'n'drop files onto the widget (currently only HTML5 supports that)
    dragdrop: true,


    // Views to activate
    views: {
      list: true,
      thumbs: true, // Show thumbs
      active: 'thumbs'
    },
    
    multipart_params : {
        nome : $('#nome').val(),
        cognome : 'gggg'
    },


    // Flash settings
    flash_swf_url : '../../js/Moxie.swf',


    // Silverlight settings
    silverlight_xap_url : '../../js/Moxie.xap'
  });




  // Handle the case when form was submitted before uploading has finished
  $('#form').submit(function(e) {
    // Files in queue upload them first
    if ($('#uploader').plupload('getFiles').length > 0) {


      // When all files are uploaded submit form
      $('#uploader').on('complete', function() {
        $('#form')[0].submit();
      });
      $('#uploader').plupload('start');
    } else {
      alert("You must have at least one file in the queue.");
    }
    return false; // Keep the form from submitting
  });
});
</script>
</body>
</html>


Se guardo il $_POST['nome] (ma anche il request è uguale è vuoto , come setto al volo multipart_params