I'm currently working on custom food items that permanently raise your attributes, and I feel like there should be an option to have a cap on how many more attributes can be raised from eating duplicate items.
For example, right now if you eat an item that boosts your movement speed by +25%, then eat the same item again, it adds another +25% movement speed, which can be increased seemingly infinitely. I would like to set a cap in the file to not increase past +50% if you eat a third item. If that makes any sense.
Also, I think there should also be an option to lose your buffs on death, at least in multiplayer.
This would be useful if you want to make powerups for a multiplayer dungeon and want to keep them balanced, a la the seeds in Four Swords on GBA. Right now the default system is more like Kirby's Air Ride City Trial.