I have projects with many subtasks which I need to track separately. I manage this by giving the work units of the project/task defined names in the description and use them to filter later. Since I change my subtask frequently and spontaneously over one day (e.g. due to phone calls from different customers) I use the overlay to start and stop work units.
So it would be great if I can edit the description of the latest work unit in the overlay or in a pop-up right after stopping a unit in the overlay so I don't have to open the main window each time I change in subtasks.