I agree we already have enough things competing for skill points. It is not a terrible idea though, and it is a lot like some skills and their uses in PnP RPG's.

BTW a couple of things about those who manufacture primitive weaponry,

Bowyer/Fletcher someone who makes bows and/or arrows.
All swordsmiths and armorers are blacksmiths but very few blacksmiths are swordsmiths or armorers.