Since the 12.0. update it is possible to create Default Task due date.
In order to do so proceed as following:
1. Click on your Profile Picture in the upper right corner.
2. Click on the User Settings.
3.Go to the Preferences.
4. In this section you may select the "Default Task Due Date".
In the drop-down field, you may select the options of Today, 1-6 days, 1 week, 2 weeks or 1 month from the time when the Task is created.