Permissions

Features exports permissions like so below. Do we need to have feature module enabled to use this?
Can we set some sane defaults with the 'administrator, creator, editor paradigm?

/**
 * Helper to implementation of hook_user_default_permissions().
 */
function _topmodo_user_default_permissions() {
  $permissions = array();

  // Exported permission: Use PHP input for field settings (dangerous - grant with care)
  $permissions[] = array(
    'name' => 'Use PHP input for field settings (dangerous - grant with care)',
    'roles' => array(),
  );

  // Exported permission: access administration menu
  $permissions[] = array(
    'name' => 'access administration menu',
    'roles' => array(),
  );

  // Exported permission: access administration pages
  $permissions[] = array(
    'name' => 'access administration pages',
    'roles' => array(),
  );

  // Exported permission: access comments
  $permissions[] = array(
    'name' => 'access comments',
    'roles' => array(
      '0' => 'authenticated user',
    ),
  );

  // Exported permission: access content
  $permissions[] = array(
    'name' => 'access content',
    'roles' => array(
      '0' => 'anonymous user',
      '1' => 'authenticated user',
    ),
  );