In version 1.8 it will be possible to import users. This option is useful if you want to add to the system a large number of users.
When you import users, the following fields are mandatory: First name, Last Name, E-mail. If the Username is not specified, it uses the Username from E-mail.
Please note: that when you import users, notification of the new account not sent. Due to the fact that the web servers have limitations on the number of mail sending at once. Imported user must use the Restore Password form to retrieve his password.
Also you can use Username as the password