Question: SolveTools:-DisplaySolutions: some questions

I very welcome this new feature Thumbs up - Free signs icons but here I am stuck

"restart; f(x):=( sin(x))/(x) :  plot(f(x),title=f(x))"


solve(f(x) = 0, x, allsolutions); about(_Z1)

Originally _Z1, renamed _Z1~:
  is assumed to be: integer



%PIECEWISE([2*Pi*_Z1, ``])


Q1: How to get also the uneven multiples of Pi?
Q2: Why is zero not excluded?
Q3: How to get the desirable output "{  Pi n        n in `&Zopf;` , n<>0"



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