Since we didn't get ziplines, why not a reuseable grappling hook instead? Could have a 12-15 block range max, and allows you to stick to things, maybe allow us to also use something in the other hand while using it.
Why not add a knife slot? something like monster hunter where a knife for butchering/skinning stuff could go into its own special inv slot, and you hit a keyboard key to use it while the crosshairs are on something. This way we could use blunt weapons without having to sacrifice a inv slot to do so, since your going to always want something to skin animals with on you at all times.
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Yeaaah, if that person is serious he's in for a rude awakening, considering most of the game is bascally being redone.