Hmm, a work around is set the triplet track to 12 steps and 4 bars (equals 48 beats per round) and the 4/4 parts to 16 steps and 3 bars, Max tempo is only 200 bpm so it is pretty slow but does allow per triplet editing.
Alternatively use the x2 multiply component set to x3.
Neither I suspect is exactly what you are after. Ability to see all steps in across bars would really help.