This is probably more of a personal point, but I've dealt with multiple instances where mods will get angered because of threads being in riff raff instead of jff and vice versa, and some of the time they even agree there isn't a real defining line between the two categories as well as with other categories. I do not as a user enjoy having to deal with not knowing what category to put a thread in, playing roulette with if I might get a warning for posting a topic in a section some argue is wrong while others could argue is right.
So, I propose a new section called Other, where regardless of what the topic is, the rules of riff raff will apply to the section, AND whatever is posted within this section will not be moved, though it can be deleted if it breaks even riff raff's rules. This section would be a catch-all solution for a topic that you are unsure where to place or feel transcends all available sections.
This section would give a safe haven for people to innovate new sections if enough people are posting a specific new category of thread consistently within this catch-all section. As-is with the current setup of not having Other, there isn't a real solid way to innovate new sections that better fit the user-base because even the user-base might be unsure of what they want unless they start noticing the same threads appearing in Other that follow a specific trend.
Additionally, I propose this section would have a feature where in the first post of the thread, the poster could type something like "SERIOUS DEBATE RULES" or "JFF RULES" or perhaps "SERIOUS DEBATE AND JFF RULES" so users can have their special hybrids/setups of rules for their topics that users can follow. Even more, one could make up their own rules for their specific thread. Breaking said made-up rules should result in a suspension at most, but this would lead the way for having very unique styles of games and threads that would be adhered to by posters within the threads of Other. This would also give the opportunity for users to naturally discover what the best rules for threads are and in time perhaps innovate how rules in other threads are formed and work.
In short, the Other section could give people absolute freedom to do any topic they want without worrying so much about what category of thread it falls under, give users expanded abilities they could have fun with with the special rules they can create within the boundaries of each of their individual threads (so long as they don't break riff raff rules), and give a natural breeding grounds of innovation for new sections/rules, since the current Suggest Ideas board is often a barren wasteland where weird ideas will be mocked since they cannot even be tested, whereas an Other section would give the opportunity to actively try out and experiment with new ideas safely in a free and fun environment.
What do you guys think?