I’m not quite sure when the item I suggest was used in Western Europe (Mesolithic or Neolithic),
but I would be quite happy to see an atl-atl in the game.
As far as I know, the atl-atl was used to throw javelins (with stone or bone heads) over a larger distance than with just using your own arm.
Personally I think, it may be good for larger ranges, but the longer the distance the less accurate it would be.
Here I have an article from Wikipedia: https://en.wikipedia.org/wiki/Spear-thrower
(If it isn’t allowed to post links to Wikipedia, just tell me, and I will delete it as soon as possible.)