In task view, give us an option to show the number of days until the due date or a countdown until due; essentially the opposite of # days overdue (instead of the date).
With just the due date showing, I can't tell how many days until the due date unless I flip back to the calendar view and count them. I'd like to know how close it is to the due date for a given task. Thanks!

Add a setting that allows the user to determine if the subtasks show expanded or collapsed.

Sort tasks by two parameters - e.g. By priority then by project. This way tasks can be better visually separated. So eg high priory tasks would all be together but home verses work projects could be separated (and seen altogether because the projects would be coloured differently)

A habit tracking part of the task view would be awesome:
creating a daily task as a "habit" by an "is this a habit?" question for making some habit lists.
ticking daily habits and workouts.

Ability to add tags to a project

Very useful tip:
for project management to see in screen of all projects list (Tasks -> Projects) not only summary task count in every project, but _also_sum_of_overdue_tasks_ for each project.

reorder tasks within a context by priority (drag and drop).

FILTERand SORT TASKS in Smart Groups and within the folder view by Franklin Covey Priority Letter and Priority Number

Requesting a smart filter option to show tasks (not calendar items) from a specific service.

For example, I have both Toodledo and Reminders as task sources. I want a smart filter option to say “Sync service=Toodledo” as one of the criteria.