Quote Originally Posted by Soulblazer87 View Post
Yes, shuriken fly further than a thrown knife and do not give a penalty (throwing a knife is considered something like unorthodox use I think, giving a penalty).
Nope, dagger has a range increment (same as a shurikan infact), so no penalty for throwing either.

Quote Originally Posted by Soulblazer87 View Post
But, would me throwing a bunch of shuriken effectively conceal me? I think not. It would, of course, draw the attention to them, but it wouldn't hide me.
I'm not saying it should conceal you, just proposing a rule that you could throw a shurikan as a free action is you use the withdraw action.

Quote Originally Posted by Soulblazer87 View Post
Yes, but shuriken aren't considered ammunition last time I checked, they are 'regular' weapons like javelins or something. Correct me if I'm wrong, I haven't studied PHB for a long time.
They are treated as ammunition for the purpose of drawing them, cost and what happens after throwing one.