Perhaps the person that suggested a three way diverter for shower head and handheld shower can answer this question: how would you recommend plumbing this? If I plumb, A, A+B, and B to each of the three outlets, when I turn on A, water will go through the AB connection and go to B as well. I didn't think about this, until I turned the water on. My thought now is to use two check valves in order to keep water from going from A or B through AB, but this wasn't mentioned in the post. Is there another way?
The American Standard R430 is a 3 way so it will only do 3 separate devices or 2 with a single and combined operation. I hope that helps.