With custom naming for block command senders that follow no special rules for the ID there is not much we can do. Also the reverse lookup was doomed to fail from the beginning. Removing that feature and make the system more compatible with the current situation.

src/com/massivecraft/mcore/sender/FakeBlockCommandSender.java

@@ -1,27 +0,0 @@
-package com.massivecraft.mcore.sender;
-
-import org.bukkit.Bukkit;
-import org.bukkit.block.Block;
-import org.bukkit.command.BlockCommandSender;
-
-public class FakeBlockCommandSender extends BasicCommandSender implements BlockCommandSender
-{
-	public FakeBlockCommandSender()
-	{
-		super("@", true, false);
-	}
-
-	@Override
-	public Block getBlock()
-	{
-		return Bukkit.getWorlds().get(0).getBlockAt(0, 0, 0);
-	}
-	
-	// -------------------------------------------- //
-	// INSTANCE
-	// -------------------------------------------- //
-	
-	private static FakeBlockCommandSender i = new FakeBlockCommandSender();
-	public static FakeBlockCommandSender get() { return i; }
-	
-}

src/com/massivecraft/mcore/store/SenderEntity.java

@@ -77,26 +77,6 @@ public abstract class SenderEntity<E extends SenderEntity<E>> extends Entity<E>
 		return SenderUtil.isRconId(this.getId());
 	}
 	
-	public boolean isBlock()
-	{
-		return SenderUtil.isBlockId(this.getId());
-	}
-	
-	public boolean isNonplayer()
-	{
-		return SenderUtil.isNonplayerId(this.getId());
-	}
-	
-	public boolean isStandardNonplayer()
-	{
-		return SenderUtil.isStandardNonplayerId(this.getId());
-	}
-	
-	public boolean isNonstandardNonplayer()
-	{
-		return SenderUtil.isNonstandardNonplayerId(this.getId());
-	}
-	
 	// GET
 	
 	// TODO: Usage of sender instead of id here is cheating but is good performance-wise so it can be ok.

src/com/massivecraft/mcore/util/SenderUtil.java

@@ -23,7 +23,6 @@ import org.bukkit.entity.Player;
 import com.massivecraft.mcore.MCore;
 import com.massivecraft.mcore.event.MCoreSenderRegisterEvent;
 import com.massivecraft.mcore.event.MCoreSenderUnregisterEvent;
-import com.massivecraft.mcore.sender.FakeBlockCommandSender;
 
 /**
  * We add an ID <--> CommandSender lookup feature.
@@ -45,12 +44,10 @@ public class SenderUtil
 	// Ids for standard-non-players
 	public final static String ID_CONSOLE = IDPREFIX+"console";
 	public final static String ID_RCON = IDPREFIX+"rcon";
-	public final static String ID_BLOCK = IDPREFIX+"block";
 	
 	// Names for standard-non-players
 	public final static String VANILLA_CONSOLE_NAME = "CONSOLE";
 	public final static String VANILLA_RCON_NAME = "Rcon";
-	public final static String VANILLA_BLOCK_NAME = "@";
 	
 	// -------------------------------------------- //
 	// REGISTRY
@@ -93,7 +90,6 @@ public class SenderUtil
 			{
 				register(getConsole());
 				register(getRcon());
-				register(getBlock());
 			}
 		});
 	}
@@ -122,41 +118,12 @@ public class SenderUtil
 		return ID_RCON.equals(o);
 	}
 	
-	public static boolean isBlockId(Object o)
-	{
-		return ID_BLOCK.equals(o);
-	}
-	
-	public static boolean isNonplayerId(Object o)
-	{
-		if (!isSenderId(o)) return false;
-		if (isPlayerId(o)) return false;
-		return true;
-	}
-	
-	public static boolean isStandardNonplayerId(Object o)
-	{
-		if (isConsoleId(o)) return true;
-		if (isRconId(o)) return true;
-		if (isBlockId(o)) return true;
-		return false;
-	}
-	
-	public static boolean isNonstandardNonplayerId(Object o)
-	{
-		if (!isSenderId(o)) return false;
-		if (isStandardNonplayerId(o)) return false;
-		if (isPlayerId(o)) return false;
-		return true;
-	}
-	
 	// -------------------------------------------- //
 	// SENDER/OBJECT TYPE CHECKING
 	// -------------------------------------------- //
 	
 	public static boolean isSender(Object o)
 	{
-		// The object must be a CommandSender and musn't be null.
 		return o instanceof CommandSender;
 	}
 	
@@ -165,6 +132,11 @@ public class SenderUtil
 		return o instanceof Player;
 	}
 	
+	public static boolean isBlock(Object o)
+	{
+		return o instanceof BlockCommandSender;
+	}
+	
 	public static boolean isConsole(Object o)
 	{
 		if (!(o instanceof ConsoleCommandSender)) return false;
@@ -179,13 +151,6 @@ public class SenderUtil
 		return true;
 	}
 	
-	public static boolean isBlock(Object o)
-	{
-		if (!(o instanceof BlockCommandSender)) return false;
-		if (!VANILLA_BLOCK_NAME.equals(((CommandSender)o).getName())) return false;
-		return true;
-	}
-	
 	public static boolean isNonplayer(Object o)
 	{
 		if (!isSender(o)) return false;
@@ -193,22 +158,6 @@ public class SenderUtil
 		return true;
 	}
 	
-	public static boolean isStandardNonplayer(Object o)
-	{
-		if (isConsole(o)) return true;
-		if (isRcon(o)) return true;
-		if (isBlock(o)) return true;
-		return false;
-	}
-	
-	public static boolean isNonstandardNonplayer(Object o)
-	{
-		if (!isSender(o)) return false;
-		if (isStandardNonplayer(o)) return false;
-		if (isPlayer(o)) return false;
-		return true;
-	}
-	
 	// -------------------------------------------- //
 	// GET ID
 	// -------------------------------------------- //
@@ -219,8 +168,7 @@ public class SenderUtil
 		if (isPlayer(o)) return ((CommandSender)o).getName();
 		if (isConsole(o)) return ID_CONSOLE;
 		if (isRcon(o)) return ID_RCON;
-		if (isBlock(o)) return ID_BLOCK;
+		return ((CommandSender)o).getName();
-		return IDPREFIX+((CommandSender)o).getName();
 	}
 	
 	// -------------------------------------------- //
@@ -256,11 +204,6 @@ public class SenderUtil
 		return getAsRcon(getSender(senderId));
 	}
 	
-	public static BlockCommandSender getBlock(String senderId)
-	{
-		return getAsBlock(getSender(senderId));
-	}
-	
 	// MARCHAL STUFF
 	
 	public static CommandSender getAsSender(Object o)
@@ -275,6 +218,12 @@ public class SenderUtil
 		return (Player) o;
 	}
 	
+	public static BlockCommandSender getAsBlock(Object o)
+	{
+		if (!isBlock(o)) return null;
+		return (BlockCommandSender) o;
+	}
+	
 	public static ConsoleCommandSender getAsConsole(Object o)
 	{
 		if (!isConsole(o)) return null;
@@ -287,12 +236,6 @@ public class SenderUtil
 		return (RemoteConsoleCommandSender) o;
 	}
 	
-	public static BlockCommandSender getAsBlock(Object o)
-	{
-		if (!isBlock(o)) return null;
-		return (BlockCommandSender) o;
-	}
-	
 	// -------------------------------------------- //
 	// GET STANDARD-NON-PLAYERS
 	// -------------------------------------------- //
@@ -310,11 +253,6 @@ public class SenderUtil
 		return minecraftServer.remoteConsole;
 	}
 	
-	public static BlockCommandSender getBlock()
-	{
-		return FakeBlockCommandSender.get();
-	}
-	
 	// -------------------------------------------- //
 	// GET ALL ONLINE
 	// -------------------------------------------- //