Not as if it's some big secret, Adam

I used to be admin for another forum, so I know about those tools. I would wager that a lot of people on ASR would know that too, and it is not hard to look at Xenforo's webpage to see what features are available.
BTW, there might be a mechanism for you to screen new members. You can change the forum setting so that ALL first posts (or first x number of posts) are hidden until approved by a moderator. This could be accompanied with a quick message saying that it is necessary to screen first posts to cut down on spam. Given the size of ASR this might involve a lot of work.