diff --git a/lib/riddle/configuration/common.rb b/lib/riddle/configuration/common.rb
index 7890f49..dc2ef1d 100644
--- a/lib/riddle/configuration/common.rb
+++ b/lib/riddle/configuration/common.rb
@@ -9,9 +9,10 @@ def self.settings
         ]
       end
 
-      attr_accessor *self.settings
+      attr_accessor :common_sphinx_configuration, *settings
 
       def render
+        return unless common_sphinx_configuration
         raise ConfigurationError unless valid?
 
         (
diff --git a/lib/riddle/configuration/indexer.rb b/lib/riddle/configuration/indexer.rb
index 892e45e..8ae42ff 100644
--- a/lib/riddle/configuration/indexer.rb
+++ b/lib/riddle/configuration/indexer.rb
@@ -6,10 +6,18 @@ def self.settings
           :mem_limit, :max_iops, :max_iosize, :max_xmlpipe2_field,
           :write_buffer, :max_file_field_buffer, :on_file_field_error,
           :lemmatizer_cache
+        ] + shared_settings
+      end
+
+      def self.shared_settings
+        [
+          :json_autoconv_numbers, :json_autoconv_keynames,
+          :on_json_attr_error, :rlp_root, :rlp_environment,
+          :rlp_max_batch_size, :rlp_max_batch_docs
         ]
       end
 
-      attr_accessor *self.settings
+      attr_accessor :common_sphinx_configuration, *settings
 
       def render
         raise ConfigurationError unless valid?
@@ -20,6 +28,15 @@ def render
           ["}", ""]
         ).join("\n")
       end
+
+
+      private
+
+      def settings
+        settings = self.class.settings
+        settings -= self.class.shared_settings if common_sphinx_configuration
+        settings
+      end
     end
   end
 end
diff --git a/lib/riddle/configuration/section.rb b/lib/riddle/configuration/section.rb
index 2c965b5..805132e 100644
--- a/lib/riddle/configuration/section.rb
+++ b/lib/riddle/configuration/section.rb
@@ -12,7 +12,7 @@ def valid?
       private
       
       def settings_body
-        self.class.settings.select { |setting|
+        settings.select { |setting|
           !send(setting).nil?
         }.collect { |setting|
           if send(setting) == ""
@@ -50,6 +50,10 @@ def rendered_setting(setting)
         
         output
       end
+
+      def settings
+        self.class.settings
+      end
     end
   end
 end
diff --git a/spec/unit/configuration/common_spec.rb b/spec/unit/configuration/common_spec.rb
index a752097..d1c5391 100644
--- a/spec/unit/configuration/common_spec.rb
+++ b/spec/unit/configuration/common_spec.rb
@@ -17,21 +17,43 @@
       common.should respond_to("#{setting}=".to_sym)
     end
   end
-  
+
   it "should render a correct configuration" do
     common = Riddle::Configuration::Common.new
-    
+    common.common_sphinx_configuration = true
+
     common.render.should == <<-COMMON
 common
 {
 }
     COMMON
-    
+  
     common.lemmatizer_base = "/tmp"
     common.render.should == <<-COMMON
 common
 {
   lemmatizer_base = /tmp
+}
+    COMMON
+  end
+
+  it "should not be present when common_sphinx_configuration is not set" do
+    common = Riddle::Configuration::Common.new
+    common.render.should be_nil
+  end
+
+  it "should not be present when common_sphinx_configuration is false" do
+    common = Riddle::Configuration::Common.new
+    common.common_sphinx_configuration = false
+    common.render.should be_nil
+  end
+  
+  it "should render when common_sphinx_configuration is true" do
+    common = Riddle::Configuration::Common.new
+    common.common_sphinx_configuration = true
+    common.render.should == <<-COMMON
+common
+{
 }
     COMMON
   end
diff --git a/spec/unit/configuration/indexer_spec.rb b/spec/unit/configuration/indexer_spec.rb
index 636a2ed..ee826f5 100644
--- a/spec/unit/configuration/indexer_spec.rb
+++ b/spec/unit/configuration/indexer_spec.rb
@@ -33,4 +33,41 @@
 }
     INDEXER
   end
+
+  it "should render shared settings when common_sphinx_configuration is not set" do
+    indexer = Riddle::Configuration::Indexer.new
+    indexer.rlp_root = '/tmp'
+    
+    indexer.render.should == <<-INDEXER
+indexer
+{
+  rlp_root = /tmp
+}
+    INDEXER
+  end
+
+  it "should render shared settings when common_sphinx_configuration is false" do
+    indexer = Riddle::Configuration::Indexer.new
+    indexer.common_sphinx_configuration = false
+    indexer.rlp_root = '/tmp'
+
+    indexer.render.should == <<-INDEXER
+indexer
+{
+  rlp_root = /tmp
+}
+    INDEXER
+  end
+
+  it "should not render shared settings when common_sphinx_configuration is true" do
+    indexer = Riddle::Configuration::Indexer.new
+    indexer.common_sphinx_configuration = true
+    indexer.rlp_root = '/tmp'
+
+    indexer.render.should == <<-INDEXER
+indexer
+{
+}
+      INDEXER
+  end
 end
\ No newline at end of file