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So instead of the typical morale + discipline duo, you could have say morale damage + offensive dice roll bonus. For the filler ones, instead of yearly prestige / fort defense, you could have average monarch lifespan, or Maximum tolerance of heretics&heathens, just to put a few ideas out there.
Unironically custom nation ideas are a great place to look for rarely used but still relevant modifiers in-game.
In the future, I'm most likely going to tweak the ocean provinces a bit, fix the docks, and maybe give Listenbourg a mission tree, but we'll see about that. Listenbourg should also start with permanent claims on parts of Portugal and Galicia.