I can talk but my own needs, and I don't know if everyone else feels the same, but I would like to suggest this:

Since knoppix is a very - very user friendly distro ideal for getting to know Linux or demo, I would add in Gnome in addition to KDE and leave the other small window managers. (if enough place on the disk)

Why?? KDE and GNOME are the two most used environments. As a demo disc or introduction to Linux, you can hardly leave Gnome out, while the smaller GUI's are less important for new users, or for trying Linux.

Is this possible ? Would others also like Gnome back in ?

Greetings,
Erik (Belgium)