[Fedora-livecd-list] Modifying ISO to include per-user files

[Todd N]

Hello,
 
After creating a LiveCD ISO image, I'd like to be able to make CDs that are
essentially identical, but have a small set of unique per-user files.  I have tried
mounting the ISO, copying its contents to a regular directory, making my changes on the
Live CD file system (not the internal squashfs file system) and recreating the ISO using
mkisofs.  However, this new ISO (when burned to a CD) refuses to boot.
 
Is there a way I can modify the ISO image to include my per-user files on the /mnt/live
file system for each user (and have the resulting ISO be bootable), rather than running
the whole livecd-creator process each time I want a new CD?
 
Thanks,
Todd