Hi Everyone,
With EAP 5, editing conf\bindingservice.beans\META-INF\bindings-jboss-beans.xml file with respect to following element:
<bean class="org.jboss.services.binding.ServiceBindingMetadata">
<property name="serviceName">jboss:service=Naming</property>
<property name="bindingName">RmiPort</property>
<property name="port">1112</property>
<property name="description">Socket Naming service uses to receive RMI requests from client proxies</property>
</bean>
is the neat solution that I found. Bold number is what you need to change.