I have not done too much here but a couple of showers with floor heater. We just don't really need it here in paradise.
My only other suggestion is the installation of two showers unlike the second pic posted. That has a diverter. This means you have to get up out of the seat and go turn the selector for the hand shower. Getting up is no fun. A completely separate control for the hand shower is much more user frendly especially if you have older folks that may be using the shower. Its no longer legal in many cities in socal due to water shortage
(like we can't control or know how to shout it off?) but we cheat and install after inspection for our clients.