I like to use tags on my tasks within Asana. I find that this is a good way of categorizing tasks into buckets that can then be viewed via the Tag view.
It would be nice to be able to view tagged tasks in the board view as well as list view. My use case is for denoting SCRUM tasks for my project teams. If the SCRUM tag is given to a task, it is treated as a priority item. We use the tag view for our daily check in calls because you can look at tasks across multiple projects. Viewing the tasks in a board view would be a nice option for our team members as it would be cleaner (in our opinion).