I'm a fan of Rally Racing, and have liked the Mitsu EVO cars for a long while. They are now available in the US, and though I won't buy one (prefer a new 'Vette), they come with a water spray feature for their front mount intercooler. The switch can either be set to AUTO or MANUAL, and in the auto mode it's obviously linked to a temp guage.
I don't know if it is a gimmick, but I think it is a great feature, and sounds like it should work. Misu went through a lot of work to put it in there, so it must have some merit. HTH.