What we ended up doing was replacing line 1139 on the controller:
system_dir\expressionengine\controllers\cp\content_publish.php
with:
$data[‘author_id’] = $this->session->userdata(‘member_id’);
to always update edited posts with the current author’s id so that the author tag will always give you the last person who touched the file. With revisions enabled we can see the last 10 revisions as well so its a good way to keep tabs on each entry.
I know it’s editing the core controllers, maybe someone has a nicer solution using a hook or extension?
Hope it helps.
Ryan