Currently no Permission exists that allows for a Role to impart admin access to all sites on an instance. Instead for admin access to be granted to all sites each User in question has to be assigned the Site Administration Site Role for each Site. This method requires significant labor for complex instances with numerous sites and introduces room for error.
This "Manage Sites" Regular Role Permission would allow for a Regular Role to impart admin access to all Sites on an instance bypass both the labor and room for error. This would help speed up Site management.