count of table rows may be defined by attribute row of both rich:datatable and rich:extendedDataTable

if you want to customize rich:dataScroller of a "rich" table make use of predefined facets:

<rich:dataScroller for="theTable" maxPages="10" fastStep="50" page="#{myBean.page}" render="theTable">

                                                  <f:facet name="first">#{labels.first}</f:facet>

                                                  <f:facet name="last">#{labels.last}</f:facet>

                                                  <f:facet name="fastForward">+50</f:facet>

                                                  <f:facet name="fastRewind">-50</f:facet>

                                                  <f:facet name="next">+1</f:facet>

                                                  <f:facet name="previous">-1</f:facet>

</rich:dataScroller>

your picture is a bit complicated but can be designed like this:

<a4j:outputPanel id="customScroller" ...>

                                        <rich:dataScroller for="theTable" ...>

                                                       <f:facet name="first">#{labels.first}</f:facet>

          ...

  </rich:dataScroller>

                                        <h:inputText value="#{myBean.currentPage}">

  <h:outputText value="of #{myBean.lastPage} pages">

</a4j:outputPanel>