Fr Michael Sherwin, OP, in the Faculté de Théologie in Fribourg, has directed some theses on moral theology recently that are on St. Thomas, and in English. The theses are in PDF format, and are fully-downloadable from the website. See:

• TITUS, Criag Stephen (2002): Resilience and Christian Virtues: What the Psychosocial Sciences Offer for the Renewal of Thomas Aquinas' Moral Theology of Fortitude and Its Related Virtues (download PDF).
• THERRIEN, Michel (2007): Law, Liberty and Virtue: A Thomistic Defense for the Pedagogical Character of Law (download PDF).

While we're on it, Fr Sherwin himself has an informative website on the University's webspace. They're keeping busy.