1. The role of the Imaam is to basically lead his community towards the right path. If you are referring to the Imaam of a Musjid appointed by the Mutawalli of the Musjid, his role would be as agreed upon between his employer, i.e. the Mutawalli, trustees, etc. and the Imaam himself.
2. What exactly is the point of your question, kindly elaborate.
and Allah Ta’ala Knows Best
Mufti Muhammad Kadwa
CHECKED AND APPROVED: Mufti Ebrahim Desai