The sounds to which you refer were, as far as I know, "borrowed" from the Total War series games. And not exactly with their blessing, if you get my drift. I suppose you could borrow them yourself, the same way.
However, note that the format on sounds has changed somewhat since the last distributed version of HW ... Native added a lot of sounds, and the subsequent code that inserts said sounds into the game. So it would be a major code rework to build such a sound pack ... not something people will just be lining up to volunteer for.
