Does a normal italian layout have keys that should behave like this?. I mean, is this how it works on Windows or OSX, or is it a Emacs specific thing?
Also, which keys are used for this? from what I can see you have specific keys for accented letters. Which key does Emacs use for accents?
Depending on how do you expect things to work, there may or may not be a way to get this working easily. I will tell you if I find something out.