By tinkering around with the mod in single player, I found out how to set custom recipes for things via Global or Carpentry Bench craftings. The NPC wand requires permission to actually spawn in an npc with, so players cannot edit recipes themselves (probably for the best!), but perhaps an admin would able to modify these things? When you're in the CustomNPC interface, under the Global tab is a "Recipes" button. I would like it if the bullet recipes (Under Global recipes, not Carpentry Bench) were changed to use the ingot and a single gunpowder, and then provide multiple (Nine, I would say) bullets.
As it stands, the recipes conflict with nugget recipes: A single iron ingot for a single bullet, for example, which doesn't work because that gets you nine nuggets.
It think you should get two bullets from one iron and one gunpowder when the new recipe is being made
