There is a description in the FAQs to change the keyboard settings.
I miss the central and important step for success to change it in the actual TC session, booted in CD-live-mode :
Before the "startx" one has to "Exit to prompt" and start X with "startx" from the command line to make this working for the actual session!
I would recommend to add this to the FAQ item.
I do not know if this is the correct thread for this remark.
Regards BB