Fire a custom packet channel registration/deregistration event, for any mods that care about that

kind of thing

src/main/java/cpw/mods/fml/server/FMLServerHandler.java

@@ -17,12 +17,14 @@ import java.io.FileInputStream;
 import java.io.IOException;
 import java.util.Collections;
 import java.util.List;
+import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
 import net.minecraft.network.INetHandler;
+import net.minecraft.network.NetHandlerPlayServer;
 import net.minecraft.network.NetworkManager;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.StringTranslate;
@@ -34,6 +36,8 @@ import cpw.mods.fml.common.FMLLog;
 import cpw.mods.fml.common.IFMLSidedHandler;
 import cpw.mods.fml.common.Loader;
 import cpw.mods.fml.common.ModContainer;
+import cpw.mods.fml.common.eventhandler.EventBus;
+import cpw.mods.fml.common.network.FMLNetworkEvent;
 import cpw.mods.fml.common.registry.LanguageRegistry;
 import cpw.mods.fml.relauncher.Side;
 
@@ -226,4 +230,10 @@ public class FMLServerHandler implements IFMLSidedHandler
     {
         // NOOP
     }
+
+    @Override
+    public void fireNetRegistrationEvent(EventBus bus, NetworkManager manager, Set<String> channelSet, String channel, Side side)
+    {
+        bus.post(new FMLNetworkEvent.CustomPacketRegistrationEvent<NetHandlerPlayServer>(manager, channelSet, channel, side, NetHandlerPlayServer.class));
+    }
 }