currently the game isnt that hard and many have wanted it to be harder.
so this would be an option in settings to get this inventory it would be like a different mode or somthing
so this inventory would be made to be more realistic. it would kinda be the old and new inventory combined. there would be one main weapon slot, and a sidearm slot, and 2 equipment slots. this would look like the old inventory. there would be a box with a scroll wheel kinda thing, basically the current inventory, next to all that. thats where ammo would go.
i have made a crude example
you could also press a button to hide what your holding it would be nice to walk around the world without anything being held