vilas
Whether you press it for the second time or not, you cannot check it on PFD if you are flying with selected speed
And on all airbuses with FMS 1, there is no option to confirm activation anyway
I totally agree with you that the color and target are changing when you switch between managed or selected and that it should be checked when you make selection on FCU
My point is that most of instructors have never been in Airbus and have never been trained there so they don't have access to that document you have mentioned. Also for most of us FCOM and FCTM are the only documents from which we can learn whether you are just begining or you are an experienced guy. And in neither of them is written that you have to announce the color of the speed target. It only says that everything should be crosschecked but it doesn't explain how exactly. And anyway it's useless if you activate while flying selected speed