Hi GH, All of that water demand will, most likely require a 3/4" water line, instead of the standard 1/2" water line, be piped to the shower to deliver additional volume and pressure. Without that, you will not have good performance from using multiple sprays, regardless of the valve type or diverter option. And yes, the volume is cut in half with shared functions from a diverter, but depending on the shower heads, may still be adequate. It's a balancing act, and will depend on your water pressure from the street. For a standard 1/2" diverter, to just switch between functions, the Delta R11000 rough-in body is reasonable and good quality. Then you choose the type of trim option and a 6 function cartridge. Otherwise, if 3/4" water line is at the shower, separate volume controls will allow all the functions to flow at full blast.

10bac10- I’m so flattered that you like my basket weave. Dimensions are below. It’s marble tile. In my opinion, using marble is not a decision to be made lightly. There are many posts in Houzz which essentially say ”Stop! Dont use marble!” But , a good friend has had a similar marble in her shower for over 10 years, with not a trace of issue. She takes special care with it and uses specific products in her shower. i don’t have marble anywhere else in my home. My basket weave is 4 feet high and 2 feet wide and bordered with a neutral colored but slightly veined pencil trim which blends with the basket weave and which I think helps to frame the basket weave. (See photo; color may not show accurately due to my crummy camera). The veins shown in the enlarged photo aren’t visible from a distance and are a subtle accent even when seen close- up. Both trim and basket weave are marble. My large and plainer wall tile is not marble. Because the basket weave is marble , I tried to avoid using it on the floor - but it looked unbalanced to me when I only had it on the wall. Again, as noted above, a friend has similar marble and has had no etching, starbursts, etc.,,that marble can get To achieve this, she uses only ph balanced shampoos, conditioners , cleansers, and soap in her shower. I do the same. I wipe down both floor and wall tile after each shower - to speed the drying process- and run a ceiling fan. I squeegee the shower door after showering, It has a special coating to repel water spots and it works beautifully. All my shower tile has been sealed and will need resealing periodically, I don’t find any of this effort a challenge but maybe that’s because I really enjoy having this bathroom after living with a truly awful one for many, many years.

On a simple Water Pik Hand Held you can set it on the holder as a standard showerhead with nemerous stream settings. Since it is on a ball joint you can point it it almost any direction with your hand, just like a standard shower, except better. Then of course, you can lift it out of the holder and use it as a hand held to clean the shower, virgourously rinse hair, or give yourself a shower bidet:-) It is such superior technology I am always suprised why all manufacturers don't use it. Well, maybe they don't use it because they want you to buy numerous gadgets and expensive wall hangers that add up to a ton of money rather than great and simple technology. Greg

we have these in our baths. it replaces the existing head and provides a handheld. either or both cna be used at once. if the link does not work goto lowes and it is item 65183 Peerless handhels massage shower head. teh handheld unit has a suction cup mount that you put anywhere and can move easily. turn the dial to provide water to the handheld, and if you want the regular head to work you turn it on during your shower and back to handheld when done. this way she does not have to stand to do it. we got it because 2x my wife has had to use a shower stool, once for a torn ACL and once after her Csection. BTW, it was actually cheaper to buy this than it was a handheld and a diverter seperately. Here is a link that might be useful: peerless shower massage handheld head