Make items stackable up to 64
You can eat every item in Minecraft or turn it into something like a totem.
Make Emerald & Ruby usable as Tools and Armor
Make uncraftable items Craftable
When a mob is killed, it can drop whatever you set in the settings.
Make Totem Of Undying auto use
Make enchantments can be combined without limits
Allows you to change gamerule in game with menu.
Make Blocks like End Portal Frame and Spawner Breakable and Obtainable in survival