I would like to propose to add one more option for Users display format. There is case where I would like to display both Name and login to ensure the issue is assigned to correct person.

Proposed changes:

app/views/account/login.html.erb

@@ -57,6 +57,11 @@ class User < Principal
         :order => %w(login id),
         :setting_order => 7
       },
+    :firstname_lastname_username => {
+        :string => '#{firstname} #{lastname} <#{login}>',
+        :order => %w(firstname lastname id),
+        :setting_order => 1
+      },
   }
 
   MAIL_NOTIFICATION_OPTIONS = [