I think the following menu item would be nice as well.
Work On From Last Task
This would add the new task with a start time of the end of the last task. This is useful when I stop one task and I’m not sure what I’m going to next. When I do decide there might be a few minutes gap. Or I’m away from the computer and start a new task. An hour later when I come back I have to stop the current task in Klok and manually change the stop time. Then it would be nice to have the next task auto start from the end of the last one.