With usernames you can disable to edit it. About changing posts title idk maybe too. But what about transliteration like in WP because it don't user friendly https://una.io/d/%D0%BF%D1%80%D0%B8-%D0%BD%D0%B0%D0%B6%D0%B0%D1%82%D0%B8%D0%B8-%D0%BD%D0%B0-%D1%85%D0%B5%D1%88%D1%82%D0%B5%D0%B3-%D0%BF%D1%80%D0%BE%D0%B8%D1%81%D1%85%D0%BE%D0%B4%D0%B8%D1%82-%D0%BE%D1%88%D0%B8%D0%B1%D0%BA%D0%B0