[Zope] Zope 2.7 on CD-ROM

Hi, I'm trying to create a ZOPE cdrom (not a bootable one) to run demo under windows or linux. I found the following doc http://www.zope.org/Members/jens/docs/zope_on_cdrom but it reffers to old versions. Everything relative to the ZODB still works but I have a problem with zope.conf. The INSTANCE and ZOPE variable are hard coded and I didn't found a way to dynamically change them, nothing on the command-line nor in the environment variable. Did I miss something ? I could create a temporary file contaning a goog configuration, but there may be a better solution. thx.