Index: lib/acts_as_cached/config.rb
===================================================================
--- lib/acts_as_cached/config.rb	(revision 7344)
+++ lib/acts_as_cached/config.rb	(working copy)
@@ -45,9 +45,11 @@
 
       silence_warnings do
         Object.const_set :CACHE, memcache_klass.new(config)
+        Object.const_set :SESSION_CACHE, memcache_klass.new(config) if config[:session_servers]
       end
 
       CACHE.servers = Array(config.delete(:servers))
+      SESSION_CACHE.servers = Array(config[:session_servers]) if config[:session_servers]
 
       setup_session_store   if config[:sessions]
       setup_fragment_store! if config[:fragments]
@@ -63,7 +65,7 @@
 
     def setup_session_store
       ActionController::Base.session_store = :mem_cache_store
-      ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS.update 'cache' => CACHE
+      ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS.update 'cache' => defined?(SESSION_CACHE) ? SESSION_CACHE : CACHE
     end
 
     def setup_fragment_store!
Index: defaults/memcached.yml.default
===================================================================
--- defaults/memcached.yml.default	(revision 7344)
+++ defaults/memcached.yml.default	(working copy)
@@ -7,6 +7,7 @@
   debug: false
   namespace: app
   sessions: false
+  session_servers: false
   fragments: false
   memory: 64
   servers: localhost:11211