You can create tasks directly from the Timeline view. Simply click anywhere on the Timeline and start dragging to the right to the right. Once you release your click, enter the task label in the pop-up to create the task.

The task created is automatically shared on the subject and with the right dates. You can assign the task from the timeline view by clicking on the assign icon on the left or open the task by clicking on the three dots on the right, and selecting Open.