In Staff View, if I select triplets and then click in the staff, I get a triplet. I then right click each note and edit it's value. For example, I may get three Es and have the change them the E, F, G.
Also, if I add notes and change their duration to triplet values, Sonar displays them as triplets AS LONG AS THEY ARE ON THE SAME STAFF. It does not work going from bass to treble or vice-versa, although it plays correctly.
So, I don't know if I am misunderstanding, or if LE has limitations not in other versions.