[Exim] LinuxConf compatible vdomains

This is a multi-part message in MIME format.
--
[ Picked text/plain from multipart/alternative ]
Will exim allow me to do a symbolic link to the virtual
passwd/shadow/alias files for my virtual domains to handle my domain
aliases?

ie, passwd.zmw.com --> passwd.pibomulti-na.com ? If so, why didn't
anyone suggest this for my dilemma?
--