While there isn't a single definitive "exclusive" article, recent coverage of March of the Eagles (MotE)
You want an event where France can enact the "Continental System," but Great Britain cannot. march of the eagles mod exclusive
Perhaps the most profound contribution of exclusive mods is their revitalization of minor and non-aligned nations. Vanilla March of the Eagles was, fairly, a game about France, Britain, Russia, Prussia, and Austria. Playing as Sweden, the Ottoman Empire, or Spain was an exercise in masochistic patience. Exclusive mods demolish this hierarchy. “Resurgent Kingdoms,” for instance, provides Bavaria with a unique decision tree to challenge Austria for German hegemony, complete with exclusive unit models for Bavarian lancers and a “Rhenish Confederation” diplomatic faction. Another celebrated exclusive mod, “The White Tsar,” focuses entirely on a revamped Poland-Lithuania, allowing a skilled player to break free from Russian or Austrian suzerainty and forge a “Third Rome” on the Vistula. These experiences are exclusive to the mod—they do not exist in vanilla and are rarely the focus of other Paradox titles. By empowering the periphery, these mods transform the map from a binary struggle of Coalition versus Empire into a chaotic, multi-polar free-for-all where a cunning Duchy of Warsaw could rewrite the fate of the continent. While there isn't a single definitive "exclusive" article,