Is it possible to use property substitution for the jboss-ejb-client.xml deployment descriptor in EAP6

Issue

• Is it possible to use properties for the username of EJB client connections for remote-outbound-connections?
• to being able to use properties inside the server for EJB remote connections to a cluster these properties must be resolved within the jboss-ejb-client.xml file in the application. But the following configuration will not resolve the properties

    <client-context>
        <ejb-receivers>
            ...
        </ejb-receivers>

        <clusters>
            <cluster name="ejb" security-realm="ejb-security-realm-1" username="${ejbuser}">
                ...
            </cluster>
        </clusters>
    </client-context>
</jboss-ejb-client>