The idea here is that you create a group and then save that both as .kgrp and as a PDF.

The PDF should contain all the fingerprints and userIds in the group and the checksum of the .kgrp file.

Then you can hand the PDF to everyone in a room. Think either Keysigning party or more importantly "Project Kick Off Meeting".

Everyone can verify their own Fingerprint and UID and speak up if something is wrong.

After the meeting people can use T6469 to quickly sign all certificates for the people from that meeting.

What I find especially charming about this idea is that no one has to ownertrust anyone but himself. So this makes it an easy way to bulk certify / exchange keys when you have no one that wants to or is able to provide the person with the ownertrust.