I think I found a bug in the FAQ.
My environment is an IIS 8.5/PHP 5.3.28-Server running MySQL 5.6.22 and phpMyFAQ 2.8.19
I'm using an LDAP integration with SSO enabled. Everything works fine (logging in, creating users, etc.) but:
I found out that it's impossible to edit users or groups while SSO is enabled.
The debug shows that the user_id is always the one that you're currently logged in to (in my case, 2). Maybe you can fix that in a future release or with a few new lines of code?

Thanks in advance!