[GENERAL] enebling regular user to create new users ?

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Hi. I know that superusers are allowed to do everything on the database, but I consider this as dangerous. I want to  have some user group with rights of creating new users and giving them some authorizations, but without such wide power as superusers have. So, I was thinking about two possible scenarios: a) to allow regular users  to create new users b) to restrict superuser's permissions   What is possible and what do you suggest ?   Thanks.