408.21 "Each grounded conductor shall terminate within the panelboard in an individual terminal that is not also used for another conductor" (Exception: parallel conductors may teminate on the same terminal if it is identified for that number of wires)
IMO that says no to your question.
You can view the NEC online by filling out a simple form for all years it is available (2002, 2005,2008) at nfpa.org, go to publications
Whatever year your ahj is currently using is the code that applies (not necessarily the latest NEC 70).