I am 79 and have been in Knoppix and archlinux and slackware and gentoo and PcLinuxOS.

I have DVD Knoppix running in TORAM 3GBRam.

If one edits isolinux.cfg one has to reburn the CD to get the cheatcodes to work.

In my system, the simple label ..."\"...enter... starts the boot with all cheat codes included.

In order to "burn" a CD, the correct mkisofs prep has to be applied to generate a new .iso which is then the candidate for the burn of the modified isolinux.cfg and the rest of the Knoppix files.

Good luck!