: Currently, sea travel is simplified; a dedicated naval feature would change how coastal realms interact.

: Included in the Starter Edition , these activities add hundreds of hours of character-driven storytelling by making peacetime travel as engaging as war.

: The Holy Buildings pack improves visuals, but deeper gameplay mechanics for specific minor religions would enhance roleplay.

For those getting started, the CK3 Wiki provides a full breakdown of every modular extension available to help you see what's already been built. Are you planning to a specific part of the game, or Finally A GOOD Crusader Kings 3 DLC

: A specific mechanic for the Byzantine Empire that shifts gameplay from traditional feudalism to managing a complex state bureaucracy. Ideas for a "Good Feature"

If you are looking for inspiration from existing high-quality features, these are widely considered the best additions to the game: Top Game-Changing Features