Considering they designed it as a self defense gun, and the expert they worked with has long advocated for double action only on defensive revolvers, I'm not sure how high a priority it is.
It would require designing a completely different gun.
The S&W DA revolver has two separate sears, one for SA and one for DA. The DAO revolver lacks the SA sear, and likely also lacks the leg that enables the hammer to cock the trigger.