A plugin that randomizes the chapters that are played during a campaign, carrying over items and health from the previous chapter for a 5 chapter campaign.
For example:
Chapter 1 - Dark Carnival chapter 1
Chapter 2 - Swamp Fever chapter 2
Chapter 3 - Hard Rain chapter 3
Chapter 4 - No mercy chapter 4
Chapter 5 (Finale) - Blood Harvest Finale
Finale wouldn't be restricted to the chapter number rules, so Crash Course finale could be the end as a chapter 5.
I hope my explanation is clear, I have no idea how difficult this would be to create but I always thought of it as a nice idea for a plugin, I couldn't find anything that would do this so I apologize if one already exists.