Now that you mentions it, my steering also makes a creaking noise at parking speeds, but so does my wife's Renault Megane (also has electronic power steering). Both the cars have been doing it since day one, so I assumed that it's just one of those things. Suppose I got so used to the Renault doing it, that when I drove the Fiat I didn't even notice it.
I have quite a list of things that went wrong with my car within the first week of ownership, but they were all sorted out without me having to put up a fight with the dealer, so it didn't bother me too much.