I will be using Google Apps hosted email for my domain so maybe you can give me some tips how to implement Email Piping in this situation?
I could e.g. create a pop.php script running periodically as Cron Job that reads the mail from the POP mailbox and than runs the file wp-content/plugins/front-end-pm-pro/pro/fep-email-parser/fep-email-piping.php to transfer the mail contents to Front End PM PRO.
Maybe you could create an example pop.php script that would do the trick and publish that on your website for domain administrators making use of hosted email solutions.
Forward email to a script is not possible for me because my MX record points to the mailserver of Google Apps. Maybe somewhere in the future you will support piping email by reading it from a POP3 or IMAP server.