Derketo’s Voice Bow buffed Accuracy by +5 before 3.0 Update. 1 point of Accuracy seems to translate into 5% Agility. So, extrapolating 5 points Accuracy = 25% Agility.
Not to mention that 5 points in Accuracy allowed you to put those points elsewhere. Which is why I usually used Derketo’s Voice even though it did less damage and a lot less penetration than the other legendary, ‘Red Mother’.
Anyway, now everyone is lined up to get ‘Reach of the Red Mother’, which, BTW, I lost when my character recently did not spawn a corpse or corpse marker. Derketo’s Voice is not so Legendary now. I think you could craft something better.