Allow custom filefield widgets to use filefield sources

This module is excellent and I'm very excited about the direction it's going. I'm currently integrating an existing drupal site with my company's internal media software, and have written a couple of custom filefield widgets for the purpose (extending filefield much the same way imagefield does).

Unfortunately I had to hack filefield_sources.module to get my widgets to display the source links. In function filefield_sources_elements, I changed the following, ~ lines 48-52:

  return array(
    'filefield_widget' => $extras,
    'imagefield_widget' => $extras,
  );

I replaced those lines with the following to allow any filefield widget to reference sources:

$filefield_widgets = array();
$widget_types = _content_widget_types();
foreach ($widget_types AS $widget => $values) {
  if (in_array('filefield', $values['field types'])) {
    $filefield_widgets[$widget] = $extras;
  }
}
return $filefield_widgets;

Not sure how safe it is to use _content_widget_types(), but this does seem like an extend-able way to incorporate any and all filefield widgets....