All you really need are the shellholders to help seat the primers straight- no other special case tools are needed.
CH4D makes shellholders to fit standard metallic single stage reloading presses in all standard shotgun gauges- and they are reasonable too.
I agree there is no reason to crimp the shells unless you're running them through a repeating action firearm that will not take them unless crimped.
Getting the crimp back out is the more difficult part, as shooting does not blow the crimp back out- and loading is out of the question with a crimped case.
Barney Fife: "Nip it, nip it, nip it!"
Andy Griffith:"Oh now Barn'...."