Registration queue

[codecowboy]

I've switched on the registration queue feature but the IP address shown is my server's IP address. In case it is relevant, the NodeBB instance is proxied via NGINX. How would I meaningfully distinguish between good / bad users using the default columns in this view?; name, IP, email etc. Also, what do the ticks and crosses mean next to the name and / or email? (not the action buttons for approve / deny on the right)

(tried to upload a screenshot but got error - unexpected token)

Is there a way to require that users answer a registration question using core functionality or is a plugin required for that? NodeBB version 0.9.3. I am also using the spam-be-gone plugin.