diff --git a/sources/src/main/java/io/akarin/server/core/AkarinGlobalConfig.java b/sources/src/main/java/io/akarin/server/core/AkarinGlobalConfig.java
index 6cb973913..9847f7bac 100644
--- a/sources/src/main/java/io/akarin/server/core/AkarinGlobalConfig.java
+++ b/sources/src/main/java/io/akarin/server/core/AkarinGlobalConfig.java
@@ -109,7 +109,7 @@ public class AkarinGlobalConfig {
         return time;
     }
 
-    private static void set(String path, Object val) {
+    public static void set(String path, Object val) {
         config.set(path, val);
     }
 
@@ -148,4 +148,8 @@ public class AkarinGlobalConfig {
         extraAddress = getList("network.extra-local-address", Lists.newArrayList());
     }
     
+    public static boolean legacyVersioningCompat;
+    private static void legacyVersioningCompat() {
+        legacyVersioningCompat = getBoolean("bonus.legacy-versioning-compat", false);
+    }
 }
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MixinCraftServer.java b/sources/src/main/java/io/akarin/server/mixin/core/MixinCraftServer.java
index 3311f0fee..d2cca76b7 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MixinCraftServer.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MixinCraftServer.java
@@ -10,15 +10,15 @@ import org.spongepowered.asm.mixin.Shadow;
 @Mixin(value = CraftServer.class, remap = false)
 public class MixinCraftServer {
     @Shadow @Final @Mutable private String serverName;
-    private boolean unhookServerName = true;
+    private boolean needApplyServerName = true;
     
     @Overwrite
     public String getName() {
         // We cannot apply the name modification in <init> method,
         // cause the initializer will be added to the tail
-        if (unhookServerName) {
+        if (needApplyServerName) {
             serverName = "Akarin";
-            unhookServerName = false;
+            needApplyServerName = false;
         }
         return serverName;
     }
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java b/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
index efec5f4cd..40af5bd22 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
@@ -10,6 +10,7 @@ import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
 
 import io.akarin.api.LogWrapper;
+import io.akarin.server.core.AkarinGlobalConfig;
 import net.minecraft.server.MCUtil;
 
 @Mixin(value = VersionCommand.class, remap = false)
@@ -79,19 +80,19 @@ public class MixinVersionCommand {
         }
         if (!hasVersion) {
             obtainVersion(sender);
-            /* TODO Option: legacy-versioning-compat */ currentSender = sender;
+            if (AkarinGlobalConfig.legacyVersioningCompat) currentSender = sender;
         }
     }
     
     @Overwrite
     private void obtainVersion() {
-        if (false /* TODO Option: legacy-versioning-compat */) {
-            /* TODO Option: legacy-versioning-compat = true */
-            LogWrapper.logger.warn("A legacy version lookup caught, legacy-versioning-compat enabled forcely!");
-            throw new UnsupportedOperationException();
-        } else {
+        if (AkarinGlobalConfig.legacyVersioningCompat) {
             obtainVersion(currentSender);
-            currentSender = null;
+            currentSender = null; // try release
+        } else {
+            LogWrapper.logger.warn("A legacy version lookup was caught, legacy-versioning-compat enabled forcely!");
+            AkarinGlobalConfig.legacyVersioningCompat = true;
+            AkarinGlobalConfig.set("bonus.legacy-versioning-compat", true);
         }
     }
     
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/NonblockingServerConnection.java b/sources/src/main/java/io/akarin/server/mixin/core/NonblockingServerConnection.java
index a1d384a26..66139db1f 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/NonblockingServerConnection.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/NonblockingServerConnection.java
@@ -14,10 +14,6 @@ import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Mutable;
 import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
-
 import com.google.common.collect.Lists;
 import io.akarin.api.LocalAddress;
 import io.akarin.api.WrappedCollections;