Subtropical climates, yes, but in all of the cases I've been able to find, they are either installed at much higher altitudes, in coastal areas, &/or in places where air-conditioning is not common, which IMO, are fairly crucial differences. (If there is a subtropical installation that I'm unaware of that is at sea level but away from any sea, and also located in a first-world nation where almost all homes, businesses and vehicles are air-conditioned, I'd love to be corrected. Really.)
I'd agree that this is probably an easy project for Doppelmayr, and concede that yes, "off the rack" was probably too flippant a characterization. All systems like this are customized to some degree, but the fact remains that Disney did not design the mechanics or the cabins. They chose from a limited array of available options, just like most of us do when we buy a car. The cabins are designed in Europe by Europeans, and fit European expectations of comfort, which tend to vary rather widely from American expectations of comfort. For example, Doppelmayr's marketing materials clearly show these cabins as having seating for 5 persons on each bench, but Disney has very wisely chosen to describe the capacity as 4 to a bench, because, as a nation, we're a tad broader in the beam than the average European, and we also have a cultural expectation of more personal space. Still, the layout of the cars is not being changed from the original design.