@tuliobaars
Did you actually test this?
This does NOT work for me (tried 2 N810 installs).

-_- which is annoying because I didn't bother to verify if it works until after I wrote a toggle script.

GUI (zenity) Script I wrote:
http://p7230.homelinux.com/maemo/key..._0.1-1_all.deb
Mirror: http://www.box.net/os2008/1/38267044/575865009

# dpkg -i keytimelight_0.1-1_all.deb
# keytimelight
(follow GUI instructions; needs to be run as root on first-run)
# exit
$ keytimelight

(and no I won't upload to extras because it doesn't work. If I come across the magic bit of code that loads the /etc/mce/mce.ini file then I'll see about that)

Source:
http://p7230.homelinux.com/maemo/key...t_0.1-1.tar.gz
http://p7230.homelinux.com/maemo/keytimelight_0.1-1.dsc
Mirror'd @ http://www.box.net/os2008/

Anyway my [interactive] script changes the two lines that are different in the mce.ini file you posted but after reboot I don't notice a difference. Clearly something else needs to be altered too.