Currently, the message given when someone tries to access a page without logging in isn't helpful:
You do not have permission to edit this page, for the following reasons:
The action you have requested is limited to users in the group: Users.
This page has been protected to prevent editing or other actions.
You must confirm your email address before editing pages. Please set and validate your email address through your user preferences.
I'd like to change it to be more meaningful (in line with most other Wikimedia projects). Not sure whether this is something you (the admins of the project) would be OK with it, so asking here.
(this would also require admin or interface-admin (not contentadmin) + importer, though it can be temporary)