OK, I've found the solution to my problem.

First, it wasn't in the configuration of the TreeCache itself, but of the 
Hibernate Cache provider.

It turns out that this behaviour is by design the default in the Hibernate 
JBoss Cache provider (hibernate-jbc-cacheprovider-1.0.1.GA.jar).

See: 
http://www.jboss.org/community/wiki/NewJBossCache14xBasedHibernate32CacheProvider.

The option responsible for this behaviour is 
hibernate.treecache.local_puts_only:

anonymous wrote : The aim of this property, whose default value is true, is to 
makes sure any put calls on the Second Level Cache as a result of a read 
operation from the database are done locally which means that data read from 
database is not replicated to other nodes.

So placing the following line in my hibernate.cfg.xml has enabled full cache 
replication across the cluster:

        <property name="hibernate.treecache.local_puts_only">false</property>
  | 

The relevant portion of my Hibernate session factory configuration now looks 
like this:

        <property 
name="hibernate.cache.provider_class">org.jboss.hibernate.jbc.cacheprovider.JmxBoundTreeCacheProvider
  |                         </property>
  |         <property 
name="hibernate.treecache.mbean.object_name">jboss.cache:service=MyTreeCache</property>
  |         <property 
name="hibernate.treecache.local_puts_only">false</property>
  |         <property 
name="hibernate.cache.use_second_level_cache">true</property>
  |         <property name="hibernate.cache.use_query_cache">false</property>
  |       
  |         <!-- Tuning -->
  |         <property name="hibernate.jdbc.batch_size">32</property>
  |         <property name="hibernate.jdbc.fetch_size">32</property>
  |         <property name="hibernate.default_batch_fetch_size">32</property>
  |         <property name="hibernate.jdbc.batch_versioned_data">true</property>

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