if this really works...

you could store all of those files in an additional folder ../dconfs (for example).
then write a script which deletes the current defaultX.conf in the hildon/welcome folder and randomly copies any of the configs in /dconfs back when shutting the system down.

this script could be stored in /etc/init.d/. then you have to symlink it to the correct rcX.d folder, i guess it would be rc0.d (http://en.wikipedia.org/wiki/Runlevel).

ehm yeah... the script should then be executed when your system goes into halt?! o.O

and you'll always have a random video at (re)boot. ^^

edit: maybe it would be the best to change it on bootup with a rc2.d script

EDIT: THAT'S MY FINAL SOLUTION FOR HAVING RANDOM BOOTVIDEOS ON STARTUP AUTOMATICALLY -> http://talk.maemo.org/showpost.php?p...5&postcount=35