Would the Note Expression popup window not make a lot of sense in the Drum editor? Drums (as used in the Drum editor) after all, are just different MIDI notes and so would appear an excellent candidate. And it is more or less the same view, graphically.
Personally, I don’t use the List editor much, occasionally. However for the ones that do, I could see a “expand/collapse” sub-list attached to each note with the NE events, and showing as a “grouped” set under the note in the grid on the right, corresponding to the events. (Chords basically have the same consequences of being “at the same time” or grouped, so to speak, on the timeline.)
Maybe someone on the developer team could give us some information on this (whether there are plans to expand on the NE concept in terms of editing or not), since the technology is quite new AND to have more vendors buy into the VST3.5 standard. Personally, I LOVE IT! Best new thing in a very LOOONG time!!!