One thing you have to be careful of is when saving to the boot floppy a second time. In my case, it always seems to come back with an error with floppy is full. Just delete or move configs.tbz and knoppix.sh and you should be fine.

In some cases, you may have to get rid of other files, such as the f2 file (cheatcodes), or the logo file to make room. I guess it depends on how much you change the defaults.

(on my boot floppy, I changed syslinux.cfg and added 'floppyconfig' and a couple of other parameters to the append for the default boot - that took a couple of bytes as well)