The actual version RF-Tools does not support code completion for derived params:
for example:
<!--code completion works for myobject->
<ui:param name="rel" value="#{myobject.inst1.inst2.inst3}" />
<h:form>
<!--code completion does not work for rel->
<h:outputText value="#{rel.inst4}"/>
</h:form>
Will this be supported in future ?
We have such a feature request in the JIRA - https://jira.jboss.org/browse/JBIDE-3526 But I can't say when it is going be implemented