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The short answer is no, this is not currently supported by Virtualmin. Historically, UW-IMAP and most other daemons required system user accounts, but now we have Dovecot and other options (Qmail, Cyrus, etc.) that support virtual users. So, there are a bunch of things you can do to make it work that way if you really want it to, but it is not considered the "Golden Path".
If you want to experiment with virtual users in Dovecot (the mail server of choice in Virtualmin Professional), then refer to their[A HRef="http://Wiki.Dovecot.org/">Wiki</A> on installation:
<DL>
<DT><A HRef="http://Wiki.Dovecot.org/moin.cgi/Authentication">Understanding user authentication</A></DT>
<DD><A HRef="http://Wiki.Dovecot.org/moin.cgi/UserIds">System user IDs used by Dovecot</A></DD>
<DD><A HRef="http://Wiki.Dovecot.org/moin.cgi/VirtualUsers">Virtual user configuration</A></DD>
</DL>
There was also a long thread about this issue posted to the Webmin mailing list a couple of months ago:
Here is[a href="http://sourceforge.net/mailarchive/message.php?msg_id=12966185">... post</a> (scroll to the bottom) on the matter and[a href="http://sourceforge.net/mailarchive/message.php?msg_id=12972062">one from Joe</a>.