The WS Throwing idea is nice, but I dunno if SE would actually do it.

What I'd really want is new, short delay, stronger (high dmg) shirukens, stackable to 99, and the greatest thing that would give shirukens a greater appeal to me would be if they don't interrupt your regular attacks, meaning no extra delay for you next attack. Matter of fact, an idea comes to mind, something like en-shiruken, for every melee attack consume a shiruken to do extra damage, and create a job trait like Sange to help you save shirukens.

Somebody mentioned NIN being the ultimate puller, that's absurd, taking in consideration that the best range for shirukens are close range, almost as close as regular melee hits.