Dell is spot on with the above. and please do follow her advice re the ideas place suggestion as the more people that start using this the better. you may also wish to see if someone's already added it.
regarding a potential workaround, i've asked some developers if it's possible to do this using the xml export & xsl transform but will have to wait to find out. this may not be possible to use in conjunction with an xslt to excel.
-jamie