Making a blowpipe-wielding small character useful

[Refplace]

The volume of acid you can have could injure an eye but not much else. However I can see it causing Aginy as a whip crack does.
Spell Arrow would be great here and the small size is good for carrying a set to draw from rather than reloading as suggested above.
With those skills almost any poison could be made but you still need to penetrate the skin. So Targeted Attack (Blowgun/Face) seems the best.