I dont think its necessary to do another separate game, just to do some kind of addon (a similar idea to the LFS Cruise license i heard up there ^^) with a biiig city and maby some cruise style car, I mean, for example, a 150 hp coupe, big and comfortable. Back to track topic, I think it wouldnt be difficult to add working traffic lights, or buildings in which you can park in, an underground parking, a car dealer for xr, another for uf, a petrol station (fully functional), a carwash? ...
I also Subaru Impreza WRX STI Fan, but only of the models from 1996 to 2007 (2007 is my favourite) and 2011 Sedan. But with 2008 Impreza I was ungry with Subaru (also because of Boxer DIESEL).