This is wonderful for those who are interested in creating a game mode that requires the use of certain mobs in a particular area.
For example, players can now set up custom spawners for use in a creative map. While this may come across as a way to exploit the game, Too Many Items can serve as a tool for map designing with items that would otherwise be inaccessible to the player. By bringing up the Too Many Items menu, players can search for items, find the names and icons for items, learn how to craft items, and even place an item from the menu in their inventory.
Too Many Items Mod for Minecraft helps players to keep track of which items are in the game, as well as how to craft them, by creating an extra menu in the HUD.