I now wonder if this version change might have been motivated more by Adriane-specific modifications.
I also suppose, this has been the motivation of KK and perhaps he will not offer a special CD version in the future.

The script "flash-knoppix" is in a new version within 7.4.1; it isn't in the difference list because it's not a .deb file. You can copy it from the mailing list. I've seen this message in my email account with Icedove and there was this script within the email text and also as an addendum. I've tested the script of the addendum and this doesn't worked for me (see my message in the mailing list).

With the new version of the script I can still not do a flash disk install with the option "overlay image" by the usual way; it seems to be a udev problem. But strangely enough, the new option "add the name of the .iso file as commandline parameter" (=> Computers without DVD drive) can also handle with the option "overlay image".