"I personally believe that they're not very popular in Italy:"

blazer

I don’t think trackballs are very popular in the UK either, but I don’t know what I would do without mine now.

To start with I did find that my fingers went into a cramp after a couple of hours, but after a quick break and a rub I could resume again, after a couple of weeks I found that I could work for much longer without discomfort, and now brain tiredness stops me before physical discomfort.

Logitech make a Trackman which is cordless and has scrolling and other customisable buttons, I think this would be ideal for you.

People told me to start with that trackballs are ok but are not so useful for drawing (if you don’t have a graphics tablet). Again I found the trackball difficult to use for graphics, but very quickly I found that it was easier for me to draw complex shapes, for example this. drawing was done for a project using Freehand and Photoshop as was this

I have a small Home Cinema which I can control with a trackball and Virtual Keyboard only using the keyboard when necessary.

In the UK we have a great many resources for disability aids, both from local authorities and the private sector for example this organisation lists both software and hardware solutions including trackballs of various styles.

I’m sure Italy is no different, try contacting your local Social Services Disability section, often these aids can be had on approval for suitability before buying.

Gavin