Must we recite Desikan thaniyan only while reciting Desika Stotra or can we recite it during the recitation of other shloka-s as well?

While reciting Svami Desikan Stotram, it is a must to recite Svami Desikan thaniyan; while reciting the stotras of other Acharya-s, it is alright to first recite Svami Desikan thaniyan, followed by the thaniyan of the Acharya who composed a particular shloka and the shloka itself – Svami Desikan has played an immense role in passing on the tradition to us through Stotras.