I'd lik ethat same capability too. Everytime I print a shipping label to my shipping al;bel printer, print my defaukt packing slip to another printer automiatically. Just makes sense and keeping the user efficient. ShipStations sister company ShipWorks can just exactly that!
That is totally doable...Go to your settings, then "Printing Setup" and assign a different printer for your packing slips. you can print labels and packing slips at the same time