Hi Paolo,
thanks for sharing your feature request!
I´m happy to tell you that this feature is already implemented through the Wave Generator.
You can press and hold the Wave Generator button and then press one of the lit buttons to randomize this parameter for the selected track.
Available params for randomization are: Note Pitch, Note Velocity, Note Mute, Note Delay, Note Length, Midi Ctrl Alpha, Beta and Chord.
Other waveforms than random are also possible. Please see the manual for all the gritty details, P.13, Wave Generator.
Cheers!