What's the trick to establishing a multi-session ZEN boot CD using Roxio

I'm trying to add the ZENworks settings. txt file to the boot CD created
via Roxio and the bootcd.iso file. Typically, Roxio defaults to
the "Disk-at-Once" method of recording and its "allow another recording"
check box is greyed out.

Alternatively, the "Track-at-Once" method's "don't finalize session"
button is unavailable. This method's "finalize session" options don't
subsequently allow for addition of the settings.txt file.

Thanks for any help.