Often at the end of a timed work period, I discover that I left the timer running for my task during a meeting, then did a quick task asked for in the meeting, then went back to the first task at hand. Once the first task at hand is finished, I realize not all the timed amount goes into that task. Would like to, for example, have 3h total, and an option to add a task to the time. Add meeting, when I type 30min, the time on the task correspondingly moves to 2h 30min. Add a third task for the quick meeting follow up, it again asks for time for that third task. Upon entering 15min, it would make the original task 2h 15min, keeping the total, and save all three time entries when I select save. Or maybe I went to lunch in the middle of the task, allow the option to enter break time that is not included in any saved time entry, it would just be subtracted from the main selected task.

Ideally, this would appear as an edit screen when the timer is stopped, with the option to turn off the edit screen for those who do not want to have an extra save/done button to press. And ideally, the edit time screen (in screenshot) would have the option to edit and add tasks as the timer is still running. Additional use case: user wants a timer running for the full workday, but as the user works, the user wants to add tasks and amount of time spent on each to the timer screen.

As it is, I have to hit save, then manually go find the task with the timer, manually edit it to be less time if I took a break in the middle, and then manually add other task time entries if I did other tasks in the middle. Too much manual entry leads to errors and extra clicking time.