For a basic generic decal sheet for these kits, I think you got it covered, and more. Could you add more? Sure, but for the average gamer you have already included more than enough. For the average modeler, well, you can please some of the modelers some of the time, but never all the modelers all the time. There will be those that will say why you didn't add such-and-such decal.
Will this decal sheet be included in all the Panzer IV kits (280076, 280077, 280078, 280079)? That would be the most logical and economical way to do it, but people sometimes don't think, so be prepared to hear, "There were no Wirbelwind or Panzer Ausf.Js in North Africa, so way are there AK markings?"