I'm considering playing a character that's a knight of a deity with shuriken as their favourite weapon. Obviously, it'd be awesome to have that as a Divine Bond, if for thematic reasons alone. How to implement it, though? Since they are ammunition, there's no easy way to handle it that I can see.
Oddly enough, it seems that darts actually count as "ammunition (thrown)", but lack the kind of text that makes shuriken so odd. They are also sorted under ranged weapons (whereas blowgun darts, which are pure ammo, are properly listed as ammunition).
The pilum and jolting dart would run into problems as well, since it specifies that they are destroyed after use.
In a related question, is the shrillshaft javelin destroyed after use? It would make sense that at least the thunderstone is used up, but nothing of the sort is mentioned in the descriptive text.
This whole thing is kind of a giant s***show. Apparently the only thrown weapons that count as ammunition for the purpose of masterwork & magical effects are shuriken and crystal chakram. I just did a search of the forums and I'm pretty sure I saw SKR say essentially that. I'm pretty tired though so it may have another dev. He wasn't even that sympathetic about it.
It sucks. It's insane. It makes no sense. But pilums (which break as soon as they hit) take full weapon cost to enchant and so do darts. I don't understand why ninjas and monks are the only classes in the game which have access to the one useful throwing weapon in it. Everybody else needs to either take exotic prof in shuriken or crystal chakram if they want to have cheap ranged with STR which they can draw as a free action. Even people with quick draw are screwed by the outrageous cost. I don't see why they can't add a western equivalent to the shuriken called "really fragile throwing pointy thing."
As an aside, you could make a RAW argument that you could use divine bond to temporarily enchant up to 50 pieces of ammunition. I'd be sympathetic to it as GM.
Welcome to the houserule zone...
You know, I think regular thrown weapons are superior for a thrown weapon specialist, just because of the Blinkback Belt. Not having to buy your weapon over and and over every 50 attacks (which can be as little as a day or two) is just not feasible. I agree that shuriken and so forth are more practical as a backup weapon, because of the quickdraw issue you pointed out.