I think I saw the new Dometic 10 button thermostat on the wall right behind the co-pilots chair. Is this the one you're talking about?Know this is nitpicky, but move the switch panel in the kitchen (Ventana Models) out to the end of the cabinet on the side, so people with short arms can reach those switches. It is now in a place the BH cannot get too, especially when slide is out, as that is the deepest point of the counter.
Move the thermostat to the main inside wall so it's central to the coach. The temp sensor/clock is on that wall, move it there. This may be only in the Ventana models. Realize that in the NA and others the dometic thermostat is not an item, it's integrated into Silverleaf in NA, don't know about DS.
It would seem to me, that if some components/features are common across all diesel lines, this would cut down on costs of parts and the labor to install them in different places on every model. I could be wrong about this. And my main complaint is the quality of the sub-components purchased, many if not all made in China, move to better built components, made in the USA, YES, that will cost more, but it would put more Americans to work, and ensure that gotchas dont happen as often. I can give example if necessary.
What you describe sounds an awful lot like a Shower Miser (RV) except for the pump. Newmar already installs these on their units. However, I suppose they could also add an option for installing the Sink Miser as well.I have converted my last 2 houses with a full loop hot water recirculating system. If the loop passes closely to the faucet you get nearly instantaneous hot water without dumping the unwanted cool water down the drain.
In a coach with finite fresh and waste water tanks, a similar system could save precious water.
The heart of the system is a pump with temperature switching. It turns itself on and off based on the water temperature in the loop. It can also be provided with a timer so it only operates during typical use hours. For an RV, there could be a switch that the user turns on the pump prior to needing hot water and allows a few minutes for the loop to get up to temp.
The hot water lines must be planned out so that the return line begins at the furthest faucet in the pipe line. The pumps are small and being located next to the water heater should be no problem.
At first, the water being tossed down the drain seems insignificant, but accumulated it is quite a bit. If I were ordering a new coach I would at least ask if they’d consider it.