Actually, a neutral filter coefficient in vanilla  is 0 0 1 0 0, if I understand what you mean by "neutral filter", which I'm assuming is just the input signal going out unchanged, using "1 -1 1 -1 1" works but it's just unnecessary, as you're cancelling out the coefficients. In the same way, you could, as an example, use the same "1 -1 1 -1 1" in Max's biquad~ and it'd work, as the feedback an feedforward coefficients are also cancelling things out. Hope I made myself clear...