I have been experimenting with the slingshot a lot, and have found that it is very helpful for low level combat. I have also been collecting countless amounts of bone, and have been collecting countless amounts of rocks.
The Idea I have thought of is a way of turning bones into an ammo. Maybe you use an axe a bust open the bone and it gives you 2-3 bone bits that can be used for ammo. These bone bits, due to the less amount of mass they would have in a real life setting, they could do less damage than a regular rock, or they could be slightly less accurate.
I don't know if it is just me, but it seems that bones don't have much use, at least at a lower level. (Which is where the slingshot is mostly useful) This would allow for a more balanced use of items.
Thanks for Reading
~Conner~