VBO+Rules: Drop-down list instead of 'data selector'.

That would be of interest for me too! Right now I create a single component for each option so that my users dont have to see the direct input.

A short answer to this would be to alter the form I guess. ;) As far as I can see, the form is created by rules, so this issue needs to be posted in the rules issue queue as well!?

Well right now I'm working with a basic form alter like this one:

<?php
/**
 * Implements hook_form_alter().
 */
function cp_pool_form_alter(&$form, &$form_state, $form_id) {
  // alter the change pool process phase rules form
  if($form_id == 'views_form_cp_pool_backend_cp_pool_backend_pane') {
    if($form_state['step'] === 'views_bulk_operations_config_form') {
      if(key_exists('pool_phase', $form['parameter'])) {
        // load the category field values
        $field = field_info_field('field_pool_phase');
        $options = $field['settings']['allowed_values'];

        // set the type to select, assign the values and hide the switch button
        $form['parameter']['pool_phase']['settings']['pool_phase']['#type'] = 'select';
        $form['parameter']['pool_phase']['settings']['pool_phase']['#title'] = t('Phase');
        $form['parameter']['pool_phase']['settings']['pool_phase']['#description'] = t('Choose the new phase for the selected pool(s).');
        $form['parameter']['pool_phase']['settings']['pool_phase']['#options'] = $options;

        unset($form['parameter']['pool_phase']['switch_button']);
      }
    }
  }
}
?>

This does not much. It checks for the right form and current step in the vbo form process. The second check hides the select from the confirmation form. After that, I check if a parameter is given for the textfield I want to alter (just double checking). If that is okay, I load the field to get the values and put this into a select that I use, instead of the textfield. At last I unset the button, because it has no meaning for me.

That's it…