Try:
Additional dots can be put in with text, if desired.
More control would need a layer, which is what layers were designed for.
Dur2: notes play back as unarticulated. Their MIDI note off times are not changed when added to triplets.
I was referring to articulations, but thanks Rick.
Articulations come in two parts: how they look and how they sound.
If you don't like the look, add text. If you don't like the sound, use a Performance Style (http://ntworthy.com/nwc2/help/MNU_ADDPERFORMSTYLE.htm)
If neither works, use layers.