I love the chronicle feature that is available to worldbuilders since it makes timelines easier to follow on a map. Now to make it even more easier would be to have lines on the map just like the lines you can use when editing maps. This would make tracking easier in games where they solely rely on chronicles.
I would think it would allow for more customizable maps in chronicles where one would track a persons movement.
Eg. I have an event on my chronicle map that dictates that a character is moving from city x to city y. Instead of having just one marker on city x, there would be a whole line between the two cities.
Seeing that it already exists on the map editor, I would assume similar places would benefit of this implementation.
More types of markers would be nice. Full polygons could be problematic if they are always present, but lines at least would be a nice addition.