add setting in config

by default mobs cannot Spawn

src/main/java/team/chisel/block/BlockCarvable.java

@@ -19,11 +19,13 @@ import net.minecraft.util.IIcon;
 import net.minecraft.world.IBlockAccess;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
+import team.chisel.config.Configurations;
 
 public class BlockCarvable extends Block implements ICarvable {
 
 	public CarvableHelper carverHelper;
 	private boolean isAlpha;
+    private static final boolean canMobsSpawnOnTheChiselBlocks = Configurations.canMobsSpawnOnTheChiselBlocks;
 
 	public BlockCarvable() {
 		this(Material.rock);
@@ -182,6 +184,6 @@ public class BlockCarvable extends Block implements ICarvable {
 	}
     @Override
     public boolean canCreatureSpawn(EnumCreatureType type, IBlockAccess world, int x, int y, int z) {
-        return false;
+        return canMobsSpawnOnTheChiselBlocks;
     }
 }

src/main/java/team/chisel/config/Configurations.java

@@ -28,6 +28,7 @@ public class Configurations {
 	public static boolean enableFMP;
 	public static boolean chiselStoneToCobbleBricks;
 	public static boolean chiselBackToVanillaLeaves;
+	public static boolean canMobsSpawnOnTheChiselBlocks;
 
 	public static int marbleAmount;
 	public static int limestoneAmount;
@@ -82,6 +83,7 @@ public class Configurations {
 		chiselStoneToCobbleBricks = config.get(category, "chiselStoneToCobbleBricks", true, "Chisel stone to cobblestone and bricks by left clicking.").getBoolean(false);
 		chiselBackToVanillaLeaves = config
 				.get(category, "chiselBackToVanillaLeaves", false, "If this is true, you can chisel from the chisel leaves back to vanilla ones. If it is false, you cannot.").getBoolean(false);
+        canMobsSpawnOnTheChiselBlocks = config.get(category, "canMobsSpawnOnTheChiselBlocks", false, "Can mobs Spawn on the Chisel Blocks").getBoolean();
 
 		/* worldgen */
 		category = "worldgen";

src/main/java/team/chisel/item/ItemCarvable.java

@@ -23,6 +23,8 @@ public class ItemCarvable extends ItemBlock {
 		setHasSubtypes(true);
 	}
 
+    private static final boolean canMobsSpawnOnTheChiselBlocks = Configurations.canMobsSpawnOnTheChiselBlocks;
+
 	@Override
 	public int getMetadata(int i) {
 		return i;
@@ -53,6 +55,8 @@ public class ItemCarvable extends ItemBlock {
 			return;
 
 		lines.add(var.getDescription());
-		lines.add(StatCollector.translateToLocal("item.chisel.nomobspawnsonthisblock.desc"));
+
+        if (!canMobsSpawnOnTheChiselBlocks)
+            lines.add(StatCollector.translateToLocal("item.chisel.nomobspawnsonthisblock.desc"));
 	}
 }