XF 1.5 Permissions

I have a forum category that I only want administrators to see.

In other forum software I'd simple tell the forum to only let the administrator group to see it, but I can't seem to get that to work here. Am I missing something? Do I have to make the category private and invite everyone individually?
I spent a whole buncha time on this and I've finally wrapped my brain around it. All my permissions are working as intended, so that's good.

I have another question pertaining to this, though I suspect I know what the answer will be. I would like to grant specific user groups freedom from seeing ads. I suspect an add-on or something will be needed for this, but if it isn't too much trouble can I get a quick outline on how this might work so I know what to ask for?