display email/name in userlist

[René Scholz]

Hello,

when I make a invitation with the Action-Menu to someone who is not a 
registered-user
this person get a login with
firstname = guest
lastname = guest
email - the correct email-address

Today I make some tests with a few collegues and nobody put his real 
name into this.
So I get displayed a list of login-user, but I can not identify.

Is it possible to display the email instead of name? Or name and email?

Best regards,

René