[Distutils] buildout bootstrap question

In older versions of bootstrap.py, the --setup-source option would let me select an alternate source of ez_setup.py. I just downloaded a new version today from http://downloads.buildout.org/2/bootstrap.py, and I notice this option is gone. bootstrap always will download ez_setup from http://downloads.buildout.org/2/bootstrap.py (assuming setuptools isn't installed, which in my case it is not). I run buildout on machines that have access to my own internal http servers, but do not have internet access. The requirement for internet access breaks this setup. Is there some reason --setup-source was removed? Thanks. Eric.