We do have documentation about the crafting.txt file. It's at the top of the file itself: https://github.com/cuberite/cuberite/blo...txt#L1-L34 If you want to use this method then you might like to take a look at my CraftMaker plugin. It's a plugin that allows people to create their own recipes by simply drawing them in a 3x3 grid.
If you want to remove a recipe as a plugin you'll have to use the OnPreCrafting hook. If you want to modify a recipe you'll have you have to use the OnPostCrafting hook. In case you want to add new recipes you'll have to use OnCraftingNoRecipe
If you want to remove a recipe as a plugin you'll have to use the OnPreCrafting hook. If you want to modify a recipe you'll have you have to use the OnPostCrafting hook. In case you want to add new recipes you'll have to use OnCraftingNoRecipe