Adding mime decode functions / full mime API

When working more with mime, it sometimes is needed to decode mail.

E.g. we capture sent mails and want to display them to an admin.

Are you open to add more complete mime API support and e.g. also add decode / header decode functions?

My research also led me to:
http://pear.php.net/manual/en/package.mail.mail-mime.php
http://pear.php.net/manual/en/package.mail.mail-mimedecode.php

Is there some reason why we're not working with those?

Please tell me the preferred direction for us to contribute.