RatBastard and others,
I have created a standalone linux screensaver daemon for the IA-1 that shuts off the backlight after a specified amount of time. To use it, you must either mount it from a Samba/NFS server, or add it to the image. You can start it automatically by calling it from the Midori /tmp/config/XFinit script (and then freeze your change). Likewise on Jailbait, you can load it an /etc/init.d/ script.
The binary and source are available on http://www.ia1hacking.com/
From the source:
// Features: Standalone daemon - no other software needed
// Designed to work with Midori Linux and Rasmus' Jailbait linux
// Works under X-windows, text console and framebuffer console
// Looks for wakeup activity on the keyboard, ps2 mouse and usb mouse
// All keyboard activity is detected, including shift keys etc.
// Timeout can be set from 1 to 2^31 seconds (default 1200 seconds)