DaasYochid – I’m not looking for sources that there is such a thing as zilzul shabbos. I would look down on anybody who felt a need to make things muttar which were previously assur. I don’t like the whole attitude.
But once the technology is out there, and it is viable to install; granting that it is halachically permissibly (which is far from simple), why shouldn’t one use the technology because of the “spirit of Shabbos”? I wouldn’t use it, and I wouldn’t appreciate anybody else doing it. But I still can’t place my finger on the exact issue, and that bothers me.