I would like to modify the default grub timeout (10 seconds) using Custom scripts or Overlay files in the SUSE Studio. It seems that /etc/sysconfig/boot (CONFIRM_PROMPT_TIMEOUT) is not the right place. File /boot/grub/menu.lst is not present in the image. How is the menu.lst created/where to set the timeout?
Thanks in advance.

SUSE Studio, Based on: openSUSE 12.1