открой engine/modules/mservice/mservice.php
найди:
  $db->query( "SELECT mid, title FROM " . PREFIX . "_mservice WHERE artist = '$art' AND title != '$titl' LIMIT 0," . $mscfg['limit_tracks_of'] );
замени на:
  $db->query( "SELECT mid, title FROM " . PREFIX . "_mservice WHERE artist = '$art' AND title != '$titl' AND approve = 0 LIMIT 0," . $mscfg['limit_tracks_of'] );