Hi Byron.
This is not possible, actually.
We did not implemented because there could be more agents than users. This is not a 1 to 1 relation.
Moreover this could be a good suggestion. I'm thinking to something that could be optionally executed if a flag is checked on the user page creation.
[edit]It's now the bug 1351 on our bug tracker[/edit]
Thank you and regards,
Marco Signorini