See: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/hadronprocess/1289.html
Please have a see http://geant4.cern.ch/support/ReleaseNotes4.9.0.html I also let you know similar inofrmation by the mail on Tue 8/14/2012 11:03 AM. And I also let you know the option is not advitesed for use in follwoing mails. This is one of the reson we do not make an example for the option.