Working on the timeline for my actual novel with AEON, I find that quite often it would be useful to know the distance between two events.
For example: I have one event, a historical one, and I am thinking about something taking place six weeks before. Or thirteen days after.
Without counting and without using a spreadsheet besides AEON, of course.
Introducing "characters" for events feels odd and bloats up the timeline.
The interface I'd like would go like this: I click on two events, the shift key pressed. These two events get, for example, two small flag icons, and somewhere - in the Inspector most likely - the distance between these two events is displayed. I can drag the two events around, having their relative distance always up to date (in several formats: days, weeks + days, months + days etc.). When I am finished, I'd click on a button that closes this display again, and the two flag icons disappear.