Huh!
I did think this possible, because some people were talking about installing from an original KDE installation, but when I looked at the LMCE demo-video I really did see the CD or DVD boot, and I saw the choice "Install LMCE" (or something like it)
I know that was version 7.04, but I can't immagine why this wouldn't be there anymore in 07.10 ...
edit: And it all seems so simple now; the CDs aren't bootable, the DVD is ...