Disable bukkits stacking of items

Basically I need a plugin which disables bukkits item stacking, the reason is if you drop an item with the same name, lore, id but different sub id like 321:100 and 321:32 they will stack and choose only one id when dropped.

 

There's no option in the API as far as I know, but you can always extend EntityItem and override a(EntityItem entityitem) so that it always returns false.

Edit - I just saw this was in the requests section, so here you go.

Download:
NoStack.jar

Source:

Code:

package com.github.one4me;

import net.minecraft.server.v1_6_R3.EntityItem;
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_6_R3.CraftWorld;
import org.bukkit.craftbukkit.v1_6_R3.inventory.CraftItemStack;
import org.bukkit.entity.Item;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerDropItemEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

public class NoStack extends JavaPlugin implements Listener {
  @Override
  public void onEnable() {
    getServer().getPluginManager().registerEvents(this, this);
  }
  @Override
  public void onDisable() {
  }
  @EventHandler
  public void onPlayerDropItemEvent(PlayerDropItemEvent event) {
    Item item = event.getItemDrop();
    ItemStack itemstack = item.getItemStack();
    Location location = item.getLocation();
    EntityItem ei = new EntityItem(
      ((CraftWorld)location.getWorld()).getHandle(),
      location.getX(),
      location.getY(),
      location.getZ(),
      CraftItemStack.asNMSCopy(itemstack)) {
      @Override
      public boolean a(EntityItem entityitem) {
        return false;
      }
    };
    ei.pickupDelay = 20;
    ((Item)ei.getBukkitEntity()).setVelocity(item.getVelocity());
    ((CraftWorld)location.getWorld()).getHandle().addEntity(ei);
    item.remove();
  }
}

Note: If you disable items from merging like this, players may be able to cause severe lag by dropping a lot of item's at once.