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Using a4j:status is probably the best approach.
I received a response from the RichFaces team as follows (although I haven't gotten it to work just yet):
One option is to use a4j:jsFunction together with a4j;status.
It would be something like this:
window.onload = myfunc()
a4j:jsFunction name="myfunc" reRender="dataTable1, dataTable2, ..."
and use a4j:status to show when the request is being processed.