If you have a flash disk install, use the Cheatcode "tz=..." and make it permanent with Micro-Remastering? With harddrive install of Knoppix you have to edit '/boot/grub/menu.lst' and there in the kernel-line at position "tz=..."

By the way: Home-folder is always the folder of the current user. Knoppix has only the user "knoppix" (and "root"). Therefore the home-folder of the user knoppix is '/home/knoppix/'.