On another post i kind did a suggestion on the craft system:
It dont need to be based on elements,could be ASP or Dex stats or strong against a monster type (wich already have in some weapons and the ones that have a certain stats cant be added more of the same), and about the effects it would be something to think about, i dont know how much resource this would be, but i think it would be nice to have your own custom made gear.