I call it distinctive because all other target actions are depending upon one of these two states.
Since the Target by Track is the default, a Toggle would be welcomed to avoid getting in the second level of the context menu every time we decide to have a Part target choice.
In fact it make sense to have it (in addition to some other place of convenience) in the Part property panel so that it's accessible from the key editor as well as the composer.
And if the Toggle could then open the relative Context target menu upon clicking it, then with one action we avoid "FIVE" mouse clicks!
That improves the workflow substantially.
