Special:ListGroupRights is sometimes confusing because it says e.g. that a group has "edit" rights, but in reality that right applies only to some subset of the wiki which can vary depending on the wiki's configuration and extensions.
This information should be shown clearly, for instance in a table at the end of the page.
I don't remember how many namespace-specific settings are possible (they should all be included), but $wgNamespaceProtection is the main one.

Version: 1.21.x
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=14466
https://bugzilla.wikimedia.org/show_bug.cgi?id=43283