The best way to contribute is to report your feedback, wish list and bugreports to the Grml-Forensic developers. Either send a mail, join IRC or subscribe to the mailing list.
Please send your mail to contact (at) grml-forensic.org. (We will respect your privacy and won't publish any details without your permission.)
You can meet us at #grml-forensic on irc.freenode.org. The official channel language is english, though most of Grml-Forensic's developers speak german as well.
Feel free to join the grml-forensic mailinglist.
Please visit the contact webpage for further details.