there is, copy the /etc/ppp folder to your floppy, then copy it back after boot.
Code:
sudo cp -a /etc/ppp /home/knoppix/
/home/knoppix is a guess (i use my native Slackware just now) if it is wrong change it to a correct path, then reverse after reboot.
that should work ok. the folder is only 67k for me so...
a simple schript could be made to do that aswell. but that might require either hdd install or a remaster of knoppix.
EDIT if you had a larger media to make your home you could save ALL configs from the knoppix menu, but... a floppy is too small/EDIT