-> Expand sling ammunition into Stones, Pebbles, Polished Stones, Metal Bullets, Whistling Bullets and Clay Bullets.
Stones: What it is right now. You shoot with a sling and it does not add damage, regardless of quality.
Pebbles: Smaller stones for bird hunting. 1x Stone makes 2x Pebbles. They fly faster and further, but deal same damage.
Polished Stone: A round stone meant to be used for slings. Made with 1x Stone. Each different stone gives different damage modifiers depending on their RL density (denser rocks = better damage bonuses). Best stone (most dense: Galena; +4 damage, second best: Cat Gold and iron ores; +3 damage; third best: Gneiss/Basalt/Diabase; +2 damage) only provides meager damage bonuses at Q10, but slowly ramps up with quality. All the bonuses are small.
(Maybe add quality changes and make it either from hand or from a Gemcutter's Wheel to bring quality up in a higher-quality workstation)
Metal Bullets: Made with lead. One nugget = one Metal Bullet. Q10 gives 10 damage. Not sure why this wasn't added when Lead was made in the game, but here's a good use for it anyway.
Clay Bullets: Between Polished and Metal Bullets. One clay = one clay bullet. +5 damage across all clay types. Needs to be 'fired' in a kiln first.
Whistling Bullets: Made with any clay. One clay = one whistling bullet. Works the same way as Clay Bullets, but produces a whistle when fired. Not sure what other mechanic to add here, but it would look (and sound) pretty nice.
More throwing weapons: War Darts, Throwing Axes
War Dart: 40 damage (half of a Boar Spear); 10% armor penetration. One Bough, 4 nuggets. More economical alternative to the Boar Spear.
Throwing Axe: 45 damage (same as Metal Axe). One bar of metal, one block of wood. More economical alternative to Metal Axe. Cannot be used as a tool, and can be thrown.