show permissions which aren't handled by a feature.

gistfile1.php

module_load_include('inc', 'features', 'includes/features.user');
$perms = array_keys(_user_features_permission_map());


$defaults = array();
foreach (module_invoke_all('user_default_permissions') as $permission) {
  $defaults[] = $permission['name'];
}
foreach (array_diff($perms,$defaults) as $item) {
 dpm($item);
}