Marcia - it appears you're referring to something different from what the protection thread is about. If I understand you correctly, you're talking about the listings of the threads (or posts) shown on the entry page of a forum, which can be customized by members in the profile edit page (i.e. the 'Number of Posts to Show Per Page' profile customization field). That field and the number of posts/threads shown on a forum entry page have no relation or importance to any of my posts in this thread on Google protection.
What I'm talking about as needing protection are the pages spun from one single, individual thread. That can't be customized in the profile pages.
And to prevent any further confusion, I've added an illustration below.
You're talking about what's encompassed in the gold circle labelled 1. That is not relevant to the protection code. What I've been describing are what I've enclosed in the green circles, labelled 2. Namely, individual posts that are popular enough to span more than one page (sequenced 1 2 3 etc). The first and the additional pages in such instances are what need the protection code.
I hope there's no more confusion.
Cheers,
...Alex