OK. AT the right thing, and add in a call to always get the right thing. Clean up patch fuzz too.

common/forge_at.cfg

@@ -114,5 +114,5 @@ public zc.* #FD:BiomeDecorator/* # All private -> protected
 public-f tj.a #FD:CreativeTabs/field_78032_a # creativeTabArray non-final
 # Packet
 public ef.a(IZZLjava/lang/Class;)V #MD:Packet/func_73285_a  #addIdClassMapping
-# World
-yc.J ()Laih; #MD:World/func_72860_G #getSaveHandler
+# SaveHandler
+public ahv.b()Ljava/io/File; #MD:SaveHandler/func_75765_b

common/net/minecraftforge/common/DimensionManager.java

@@ -1,5 +1,6 @@
 package net.minecraftforge.common;
 
+import java.io.File;
 import java.util.ArrayList;
 import java.util.BitSet;
 import java.util.Hashtable;
@@ -29,6 +30,7 @@ import net.minecraft.world.WorldServer;
 import net.minecraft.world.WorldServerMulti;
 import net.minecraft.world.WorldSettings;
 import net.minecraft.world.storage.ISaveHandler;
+import net.minecraft.world.storage.SaveHandler;
 import net.minecraftforge.event.world.WorldEvent;
 
 public class DimensionManager
@@ -311,4 +313,20 @@ public class DimensionManager
             }
         }
     }
+
+    /**
+     * Return the current root directory for the world save. Accesses getSaveHandler from the
+     * @return
+     */
+    public static File getCurrentSaveRootDirectory()
+    {
+        if (DimensionManager.getWorld(0) != null)
+        {
+            return ((SaveHandler)DimensionManager.getWorld(0).getSaveHandler()).getSaveDirectory();
+        }
+        else
+        {
+            return null;
+        }
+    }
 }

patches/minecraft/net/minecraft/entity/item/EntityMinecart.java.patch

@@ -23,7 +23,7 @@
      /** Array of item stacks stored in minecart (for storage minecarts). */
 @@ -52,6 +59,25 @@
      @SideOnly(Side.CLIENT)
-     public double velocityZ;
+     protected double velocityZ;
  
 +    /* Forge: Minecart Compatibility Layer Integration. */
 +    public static float defaultMaxSpeedRail = 0.4f;