What is with the additional spaces for user1, user2, user3.....user20 in edit profile? You can add names in there but you cannot do anything with them. When I try to login as other user it doesn't work, when I go to list an item, I don't have a choice. So why are these spaces provided?
These are custom data fields that you can ask the user to enter and you can either display it in their profile or colect these information for other purposes not for other users to login to the same account!.