Due to regulatory restrictions, we don't have anything regarding shutting engines for departure, due ofcourse to the fact that you need ground fire cart incase you get a tail pipe fire. However, it is recommended by our "airline" that we take initiatives to preserve fuel, and therefore shut one engine for taxi-in. Nothing mentioned by the regulatory authority for taxi-in (have to check this one up). At New Delhi airport we've ended up burning 700 kgs sitting idle.