Seeing as I am on the custom colour topic myself to-day, your suggestion sounds interesting.
Mind you, I don't speak Italian; I am just trying to piece this together with what I remember of my Latin: is that what you are requesting:
"Is it possible to add a different colour indicating position 2,3,4,...; and add another for the trailing stop in the Auto-Greenup window as an alternative for the stop"
By colours for 2,3,4, do you mean something similar to the yellow label for the favourite?
Are you suggesting to display an underline for the stop loss similar to the green line displayed in the back/lay box containing the odds required to green up?