(1) Start time + duration (bar beat:division percent), and text describing the event. The graphics next to each time indicate the relative position, i.e. the percentage. I just noticed that there is a graphics bug, introduced when I changed the percentage range from -50..+50 to 0..99 a few versions back.
(2) No editing, at the moment. The list view is only usable for diagnostics, where you for example can check for overlapping events, or zero duration events.
The code for the eventlist is very old, and I haven’t updated it in a long time.