I've always thought the Slingshot was a wasted opportunity, and so was throwing stones, so heres some new stone types and a new weapon, plus some tweaks to the Slingshot.
TWEAKS:
The Slingshot now does 25% more damage in general, and 75% more damage to animals. Headshots with the slingshot have a 25% chance to briefly stun weak enemies for about 3 seconds and 10% for stronger enemies.
NEW STONE TYPES:
Fire stone: Crafted with 4 stones and one cloth, these stones can be lit and thrown, though be careful not to hold them too long or you'll burn your hands. Works better with the Slingshot.
Metal balls: Craftable with a watch, tape and 4 stones, these stones will stun enemies for 2 seconds longer and have 60% chance to stun weak enemies and a 30% chance to stun stronger enemies.
3D Printed stones: Stones that deal around 20% higher damage then regular stones, they fly faster and further. They can be made with 25 printer resin.
Shock rocks: Made with 4 stones, a copper wire and 1 battery pack, these stones will shock any enemy they hit no matter if it hits their head or body. If using a slingshot or sling, they will deal 200 damage if they hit the chest.
NEW WEAPON: The sling.
Craftable with 1 rope and 1 cloth, the sling is a primitive slingshot which functions around the same as the Slingshot, except it's quite a bit harder to aim and does 10% more damage to animals then the slingshot.