Unbind keys ability.

I want to unbind the Z key hiding items on the ground.
I don't want it, I accidentally hit it, and I'll never use it. I just always want my items shown.

So how I unbind other keys is I bind whatever key it's using to something else, like my change weapon set I put to Z, then I change it back to X. But when I change it back to X, the game automatically reassigns Z to the hide items again.

Just adding a way to simply unbind keys would be great. I don't need a keybind for everything the game offers. Just the things I want to use. For now I've bound the hide items to my numpad "-" key. Which keeps me from hitting it accidentally. But a way to not need to assign it to anything would be fantastic.