I'd like it if Narrators could add additional rulesets to the game. Storium works great as a simple tool and I think that should remain the default option for most games - but what if the Narrator could add more complex rule sets on top of that?

Imagine the option to customize how Strength and Weakness cards work (set the default # of cards to a different amount, allow characters to have one of several different kinds instead of a single stack of one, etc). Or if you could allow Assets to sometimes produce Strong outcomes on Challenges, or if you could code an Asset to change when certain parameters are met ('OnUse', for instance.)

That's just a few ideas I had but I like the idea of being able to customize the rules a bit more for each game.