I admit this would be really convenient as well, however here is what I’ve done as a work around:
There are many times where you have a task that requires multiple different people to complete a part of that task or maybe it’s just you, but you want/need to do parts of the task on different days. To get around that, I’ve been making the initial task and leaving it unassigned and undated. Under that task, I create subtasks layout out each part of the job. Then I can assign those subtasks to individual people or on person with different dates.
In my example, I have one task under a project section, “writing articles reminding people to sign up” , but this task needs to be done on multiple websites and I wanted to break up the work between myself and a co-worker while stretching them out over about a month.
I created the task, then created subtasks for each website to write an article on, then assigned the individual subtasks to myself or my coworker with the desired due dates.
One of the only negatives I’ve found about this is that subtasks do not hold the color coding on a calendar view like a task does when assigned to a specific project. As an Asana Together Ambassador, I have yet to find a way around that one besides just making your subtasks regular tasks, but that doesn’t really look right structure wise.