Besides priorities it would be great if we could flag tasks like in outlook (choice between various colours) or more simply like activecollab's starred list.
A separate list is then possible (can also be integrated as a filter in my tasks list)
Usage example: indicate to others that this task is work in progress. % completed could be an extension of this.
How is this different then using a "flagged" tag?
My guess is the iconic value of seeing it at a glance rather than searching / sorting by tag?
It is not possible to tag tasks (only tasklists)
Navigation from tags also require multiple clicks: 1) tag tab 2) tag choice 3) task list and then you get to your tasks
With the icon you would get there with 1 click.
It is alo not possible to access the tags from My tasks (my most used page as it shows tasks across projects)