How are your users getting into WHD? Are they local users, AD users, or open directory users?
If they are AD or OpenLDAP you can fill in that information in their profiles. This is also useful as it could show in places like your email client such as outlook or Lotus notes as well. If you do not fill that information in at the network level you can force the user to make those fields required on the profile page and have them fill it out manually.
If they are local users you need to fill it by hand or have them do it by making this a required field in the users profile.