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If you see the following code from
views/filefield_handler_views_data.inc you should note the "TODO." It would be great if this were fixed. I believe it would fix in the imagefield_extended module's queue and allow many other modules that use the data field to be more extensible.
$form['data_key'] = array( '#title' => t('Data key'), '#type' => 'radios', // TODO: Pull these values from the modules that extend FileField. '#options' => drupal_map_assoc(array('description', 'title', 'alt')), '#required' => TRUE, '#default_value' => $this->options['data_key'], '#description' => t('The data column may (or may not) contain any of the following data. Select the data that should be output for this field.'), '#weight' => 4, );