Thanks Marc.
About sound, you are right but I didn't spend time on it, because the real sound of the car is almost different. "Year ago it was recorded, live, but with too many noises for being sampled correctly": this is the explanation I've got and no help at all, so on my side the sound can remain as it is.
About the steering wheel I asked for a confirmation and, if no other real driver affirms the contrary, I can only believe it. For sure also the tires have a great impact... The real world tire can last for a whole season!! The car is very very light and the caster they use do not help to feel a stronger steering wheel.
This is a car totally different by the most of the cars available in rFactor2, it is little, short, light, cheap... and it behaves differently by the most of the cars in rFactor2: maybe is not a bad thing.