This topic http://www.knoppix.net/forum/viewtopic.php?t=17024 includes simple script to modify Knoppix3.8 linuxrc to have ability through cheatcodes for “full control for knoppix initiation”: including saving changing’s directly (UnionFS) to hd or usb stick based directories without inconvenient persistence home and a real ramdisk creation; run custom scripts automatically, or to interrupt linuxrc initiation and make changing manually.

It would be nice if this modification will be included in the next Knoppix version. Also, leave linuxrc in the root directory.