And I just realized you were referring to fortress mode. Suddenly my signature is extremely relevant. Darn my skimming nature.
Yeah, my advice was useless, ignore it. I thought you wanted to make a weapon that civilians in adventure mode would wield.
No worries, but while you are here, could you help me with something else?
Can we make... thrown weapons. Like javelins, jarids, throwing knives etc THAT WOULD ACTUALLY BE THROWN in fortress mode... Followup: can poison them with something? Like a new Alchemy Workshop, using the alchemy skill to poison weapons to inflict some sort of syndromes, against the opposition. Price for that may be hefty, as it would be rather unbalanced...
I don't think you can make weapons that are thrown by NPCs, but you could try and be cheaty by making a ranged weapon named something like "Hand" and ammo for it. I'll go ahead and test this myself, as I'm a bit curious now. Might work how you'd like, but it's the closest to a throwable weapon I can think of.
As for poison, no, not to my knowledge. I think in adventure mode there's a way to do it, like throwing it into a pool of some modded liquid or something, but I've never gone through the trouble to test that. And weapons don't carry the syndrome of their material, from what I've heard. However, it's notable that I don't use DFhack, and from what I've heard it can do some wondrous things.
EDIT: Hands that throw spears work surprisingly well. The only issue I've found is the whole Porcelain Hand thing, but you could always call it "glove" or something.