Sam2 –
I am not sure what you are referring to. If you mean R’ Shlomo Zalman’s chiddush of “the normal way” precluding kil’achar yad, I don’t know what you mean by haskamas haposkim. It just isn’t true; I’ve heard many poskim mention kil’achar yad as a valid point when it comes to opening refrigerator doors, turning on hot water faucets, etc. Kil’achar yad is still assur mid’rabbanan. As for your point that “otherwise, we could remove all M’lachos D’Oraisa Bizman Hazeh by using Gramas or electronics”; that is not a halachic argument.
With regard to the davar she-eino miskaven point: As I said, it is not just my reasoning, but something I have heard from a number of prominent rabbanim.
For example, R’ Tuvia Goldstein told someone I know that for a man to comb hair normally is not a psik reishe even though during the course of the combing hair will certainly be plucked out, since each individual time combing motion is not a psik reishe. He explained his reasoning in precisely this manner; i.e. that although the entire combing session presents a psik reishe, each individual combing motion does not. I have also been told by, or heard secondhand from at least three rabbanim that it is okay to walk in front of a house that has a light run by a motion sensor that will certainly go off; presumably by this reasoning. I have also heard other psakim that rely on this reasoning.