When designing wood shear walls, I usually take the base shear per wall and multiply by 0.7 or divide by 1.4 to get ASD.
Using Table 4.3A wood-frame shear walls in the 2005 NDS (I don't have the 2012 yet, its on its way), footnote 1 refers to section 4.3.3 to determine ASD allowable unit shear...