What does this enhancement do?
There are project or ticket related events that do not currently get displayed in the timeline.
One example of this is changing the state of a ticket but there may be others.
It is hard to say whether or not "all" information should be displayed here, so this may be intentional.
In this case, the ability to determine the granularity (groupings) or the specific events (full control) of which events are displayed in the timeline would be preferable.