I think this is an interesting idea, and I agree that information is not enough. In fact, one of my talks is on the many factors that may impede a woman from making optimal choices for herself and her baby from the context of her own value system. However, there is a problem with any tool that tries to connect women's preferences with the degree to which the women are inner or outer directed: Regardless of whether a woman is normally self-actualizing or tends to look to others, pregnancy puts her in the position of needing to rely on those she assumes to be experts on issues where the stakes are high for the choices she makes. This makes it particularly difficult to override what the culture and those experts tell her even if she would ordinarily be inclined to trust her instincts.
The study you cite illustrates this problem. It assumed that women were choosing VBAC or repeat cesarean based on their own predilections. I have several studies of women's choice around VBAC carried out during the first wave of VBAC activism in the 1980s. Some women chose VBAC and most chose repeat cesareans, but no woman chose VBAC if her physician opposed it, some women who wanted a VBAC were talked out of it, and the reasons women chose repeat cesarean surgery were mostly based on misinformation about about the comparative risks of VBAC vs. repeat surgery.
-- Henci