Let other modules know that mail was changed

How can we let other modules know that we've changed the Email? Do you think that adding a user hook invoke can be a solution?

I'm thinking on a solution (patch) like this in function function email_confirm_user_change_mail(). This is around line 187:

      watchdog('user', t('User %name used one-time e-mail change link at time %timestamp.', array('%name' => $account->name, '%timestamp' => $timestamp)));
      db_query("UPDATE {users} SET mail = '%s' WHERE uid = %d", $new_mail, $account->uid);
      user_module_invoke('mail_changed', array('new_mail' => $new_mail), $account);
      drupal_set_message(t('Your e-mail address is now %mail.', array('%mail' => $new_mail)));

This allow a module to invoke the hook in this way:

function mymodule_user($op, $edit, $account) {
  if ($op == 'mail_changed') {
    
    //... perform some tasks... You can use $edit['new_mail']
  
  }

}

I need this in a custom module but I want to take an approach that maybe will be included in future releases of the module.