These ideas don't actually affect "Grinding" or anything like that for once.
Since W4 seems to get more and more closer to realistic, I think a few things would be a nice add.
1 - Animal sounds. By this, I don't mean when they die. I mean more like, they'll make sounds, and deciding on how close you are to them, is how loud you'll hear them. Like a boar would make a Pig grunt type sound ever say.. 7 to 10 seconds? Would a nice fix to those who can't use "X-ray" on Gilbertus' client.
2- Water falls. Would be pretty cool to hit a waterfall at a dead end. It could contain rarer fish that aren't found anywhere else. Though the only problem, would be the depth/height of the waterfall, since HnH's world is flat.
Number 2 is pretty much useless, but figured I'd throw it out there.