I use a /data in the root of my filesystem for some things I've added- documentation, karamba themes, stuff like that.

What I do when remastering the CD is point anything that needs those files to /KNOPPIX/data , so it works when running live from the CD. And then I edited the hdd-install scripts to create a /KNOPPIX during the hddinstall and move /data in there (so that my links don't break after hdd-installing).

It's a work-around. I'll post the lines of code I used later when I get home.