last i checked nobody was following a lead here, fellow.
that being said, there are already poison/sleep darts.
if you take a look at shuriken, the thing they need most is a place post level 60, they just kind of stop there.
but the synthesis recipe for shuriken has always been a little bit impractical. one full ingot means 33-99 shuriken. the price is unfairly high, even now. i don't mind if they cost a little more than bolts or arrows, but i would at least be able to throw one and still be able to pay for these ninja tools.