Does Multiupload Filefield Widget for Drupal provides a Form API element?
Yes it does, as defined in multiupload_filefield_widget_element_info(). The element type is mfw_managed_file, so you can use something like:

$form['multi_upload_element'] = array(
  '#type' =&gt; 'mfw_managed_file',
  '#title' =&gt; t('Some file'),
  '#upload_location' =&gt; 'public://',
);