[support] Username vs. real name in CCK userreference module

I've been trying to use CCK userreference to set up a field and a content type form where users can be chosen. My idea is to have a "meeting" content type, and "participants" would be a field where users participating in the meeting (from the ones registered in the site) can be chosen.

CCK userreference is showing the usernames, but I'd like the "real name" to be chosen. I've set up a field in the profile of each user showing the real name.

I've managed the real name to show in the "submitted by" tags by using the discussion in: http://drupal.org/node/147188

But this does not change the usernames in the CCK userreference field.

Does anybody know a way of achieving this?