Made certain classes private. No need to expose them to the API.

ProtocolLib/src/com/comphenix/protocol/injector/NetworkFieldInjector.java

@@ -23,7 +23,7 @@ import net.minecraft.server.Packet;
  * 
  * @author Kristian
  */
-public class NetworkFieldInjector extends PlayerInjector {
+class NetworkFieldInjector extends PlayerInjector {
 
 	/**
 	 * Marker interface that indicates a packet is fake and should not be processed.

ProtocolLib/src/com/comphenix/protocol/injector/NetworkObjectInjector.java

@@ -16,7 +16,7 @@ import org.bukkit.entity.Player;
  * 
  * @author Kristian
  */
-public class NetworkObjectInjector extends PlayerInjector {
+class NetworkObjectInjector extends PlayerInjector {
 	public NetworkObjectInjector(Player player, PacketFilterManager manager, Set<Integer> sendingFilters) throws IllegalAccessException {
 		super(player, manager, sendingFilters);
 	}

ProtocolLib/src/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -63,6 +63,10 @@ public final class PacketFilterManager implements ProtocolManager {
 		 */
 		NETWORK_HANDLER_FIELDS,
 		
+		/**
+		 * Override the network handler object itself.
+		 */
+		NETWORK_MANAGER_OBJECT
 	}
 	
 	// Create a concurrent set
@@ -352,6 +356,8 @@ public final class PacketFilterManager implements ProtocolManager {
 		switch (playerHook) {
 		case NETWORK_HANDLER_FIELDS: 
 			return new NetworkFieldInjector(player, this, sendingFilters);
+		case NETWORK_MANAGER_OBJECT: 
+			return new NetworkObjectInjector(player, this, sendingFilters);
 		}
 		
 		throw new IllegalArgumentException("Cannot construct a player injector.");