It would be very handy, if you could press a "play" button on a Task panel to start tracking the effort of the Task. After you have made the work of the Task you could press a "stop" button to end the effort tracking (calculation) and the panel could show you how many hours you did the work and ask you how many hours there is still finish the work (To Do hours). There could also be a third button, i.e. after you have pressed the "play" button to start tracking the work hours you could press a "pause" button to pause the effort tracking. Pressing "play" button again the tracking could continue tracking the hours. You could, of course, press a "stop" button after pausing the hour tracking.

This could make the, as such, boring time tracking very easy (and almost fun).