Ability to export the email body as XML using XSLT transformation.
This would allow to generate an XML and store it for further processing. The XSL transformation could use as parameters the field values extracted.
If the body of the email is text, the text could be automatically wrapped around xml element allowing for XSL transformation.
We are now offering a plugin SDK with the PRO Server version on our site that allows you to do any XML exports or XSLT transformations via that plugin interface. See http://gearmage.com/buymaildownloader.html.