I like it more or less as it is.
I can't see Alfa changing much without going back to the drawing board. The weight of the car will remain at the rear, and the steering will remain unassisted, and the car will stay under 1000 kilos - and the rest is physics.
The car does tramline a bit (I think that is what the reviewer is trying to say in a roundabout way) but then so do most sports cars with large wheels. It's just that the 4C is about half the weight of most of them: and so it reacts more to aspects of the road. In a way I like that, as it tells you what is really going on, but others may prefer all the bumps and contours in a road sanitised away. Fair enough.
Oddly, I think the failings of the car are more around the lower gearing and the ECU turbo mappings, but that isn't mentioned.
This review is far from complimentary about the 4C, but is much more on the money:
https://www.youtube.com/watch?v=MEIVv2biGn4
Maybe people want the perfect car, but I like a car with character ahead of perfection. That's why I loved my 3200GT more than my GranSport(s).
I don't think much can be changed with the 4C as there is so little that can be tweaked beyond the ECU. It's a car you learn to drive through racking up the miles, and after a while you (the driver) tune yourself into what makes the car tick.
I think the car is stellar and huge fun on country roads, it's just a bit of a PITA around town and on roundabouts. But then you don't buy a 4C for town and roundabouts.