Would you please consider moving the story threads into a category of group all their own, much like the gallery? These threads have a lot of churn, and their constant updates make identifying other non-fiction content difficult.
As Arthmoor said, they will dominate the recent threads. Looking at General Discussion, it's not a busy forum right now - relatively speaking. Busy is when you have to scroll more than a single page to read all recent thread.
If they start to proliferate and the posters themselves want a separate section that's fine but banishing them from General at present seems excessive.