We only had the mature guidelines thread listed in the 1x1 section and anything else was removed because it did end up clashing with the main rules of the site. Even now I think I may have to have a quick check up on the mature section to make sure that I covered the right wording.
In saying that, multiple threads by single individuals is not really grounds for an entire "one thread per person" rule as some people will refresh their interest checks with a new thread that has no clutter, or someone who is looking through the pages may inadvertently Necro an old interest check that was meant to lay dormant. In the case above honorandpride was at work and bumped up a few threads with the honest mistake of not realising it would take up a large portion of the front page. (also thank you so much for being understanding and I hope you do get an enjoyable RP)
What multiple threads can be covered by is the new clarification on the spam rules:
"Spamming includes both the posting of unrelated material on the site and excessive posting of the same content across multiple topics and forums.
The reason why I am talking about the spam rules are because if we were to compare the 1x1 section to say casual, no one would really have a major concern if someone tried to start up three casual RPs at once, and yet in the 1x1 section it can create an unwanted stress on those who get bumped off the main page. It's also worth noting that in one casual RP you can get 5 or 6 applicants while in a 1x1 it's maybe just 1, as well as you might have a SFW interest check and a NSFW one too.
In the end this kind of stuff does happen on a rareish occasion, maybe twice a year, and it's easier to just PM people and remind them that others are looking for people too, rather than pinning a thread for a people who read it and already do the right thing when some people don't even read the rules to start with.