Correct.
You mean items that summon? Not really, there is no way to determine if an item summons a boss or event. They should be in Consumable though.
Don't know what that is, but I guess?
It was a 1.2.4.1 TAPI mod that was much like this. I used it to test items and bosses.
[doublepost=1458380771,1458380469][/doublepost]Woops, I encounted an error:
Object reference not set to an instance of an object.
at EnemyMods.NPCs.gNPC.SetDefaults(NPC npc)
at Terraria.ModLoader.NPCLoader.SetupNPC(NPC npc)
at Terraria.NPC.SetDefaults(Int32 Type, Single scaleOverride)
at CheatSheet.UI.NPCSlot.Init(Int32 npcNum)
at CheatSheet.UI.NPCView..ctor()
at CheatSheet.UI.NPCBrowser..ctor(Mod mod)
at CheatSheet.CheatSheet.AddCraftGroups()
at Terraria.ModLoader.ModLoader.AddCraftGroups()
at Terraria.ModLoader.ModLoader.do_Load(Object threadContext)
Edit: Found it, Prefixes for enemies caused it obviously.