Mohammad Hussein Fadlallah Quotes
Saying "Ameen" is permissible after reciting the Surah of al-Hamd in the Salat (but it's still not part of the Salat) especially with the intention of supplication.
Citations
Fadlallah, Mohammad Hussein. Fikh al-Shari'a. Dar al-Malak, 1999.
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Grand Ayatollah Muhammad Husayn Fadlallah was a prominent twelver Shia cleric from a Lebanese family. Born in Najaf, Iraq, Fadlallah studied Islam in Najaf before moving to Lebanon in 1952. In the following decades, he gave many lectures, engaged in intense scholarship, wrote dozens of books, founded several Islamic religious schools, and established the Mabarrat Association. Through the aforementioned association, he established a public library, a women's cultural center, and a medical clinic.