for context: i have been working with a friend for some time and we got into a argument and i think he might ruin some hard work and i cant remove him for some reason does anyone know why or how to dupe a mod?

Only the person who created the mod should be able to remove team members, as giving people who have been added the ability to do so would lead to scenarios where someone is invited to help on a mod, then removes everyone else from it (either accidentally or on purpose).

As for duplicating a mod, this currently isn't possible, however I will add this to my todo list.