I agree with you Jim that many groups of users use the Display Name as a nickname field. This is more important if used in small organizations for nicknames and such but is still important for large groups of users as well. Auto populating the field with a default format is a good idea...better would be to have the auto population have options  to set the default like First Name, Last Name or  Last Name, First Name
 
Either way the field is important, used, and follows suit with other webmail client projects.
 
Pat
 

I also find it common that my users put nicknames in the Display Name rather
than any combination of first or last. For instance, they might put "Bobby"
in the display name, but "Robert Blahblah" in the first/last field.

I wouldn't want to see "Display Name" go away entirely, but having it
automatically populated (if blank) from First and Last is a good idea.

Jim
_______________________________________________
List info: http://lists.roundcube.net/dev/