Formalize the Media Mover hook

I've been working over the weekend to finish up the media mover hook system. I think I've finally finished out the final form of the hook and the different options that are available. Here's a commented version of what I'm using in the media_mover.inc file

/**
 * Implementation of media_mover hook
 */
function media_mover_media_mover($op, $action = null, $config = null, &$file = array() ) {

switch ($op) {

// give your driver a name
case 'name':
  return "Media Mover module";
break;

// create a new configuration option set
// $type is used to ensure namespacing is kept consistent
// in the form xname space.
// returns a form array
case 'new_config':
  switch($action){
    case "harvest:select drupal uploaded files":
      return _media_mover_admin_harvest_config($action);
    break;
  }
break;

// set standard configuration for this module
// displayed on admin/settings/media_mover
// returns a form array
case 'admin':
  return _media_mover_admin();
break;

// defines what type of driver this module is
// array of harvest, process, storage
case 'verbs':
  return array("harvest");
break;

// defines the name of what this module does
// array of definitions
case 'actions':
  return array("select drupal uploaded files");
break;

// defines directories (under master media_mover directory)
// this module uses
// array of directories, will be created under the default
// media_mover directory, set in admin
case 'directories':
break;

// allows for module to add additional data in a different db
// add file to db action. called from media_mover's mm_files_db_add
// by default, medial_mover's files table is used. $file is available
case 'add':
break;

// allows for module to fetch additional data
// add file to db action. called from media_mover's mm_files_db_fetch
// by default, medial_mover's files table is used. $file is available
case 'fetch':
break;

// allows for module to update additional critera
// add file to db action. called from media_mover's mm_files_db_update
// by default, medial_mover's files table is used. $file is available
case 'update':
break;

// functions called on harvest op
// returns an array of $files
case 'harvest':
  return _mm_harvest();
break;

// functions called on process op
case 'process':
break;

// functions called on storage op
case 'storage':
break;

// custom theme a file assoicated with this module
case 'theme':
break;

default:
  return;
break;

}
return;
}