A 'Remind me about this' feature—like the one in Slack—would be great if linked to a Comment in a task, or to a Task itself. The options off that menu could be the same as Slack's: in 20 minutes, in 1 hour, in 3 hours, Tomorrow, Next Week.
When that time comes, then the task would re-enter the user's Inbox.
This would help avoid things falling through the cracks, such as when you ask someone a question (in a Comment) in one of the tasks you have assigned to them, and you want to make sure you get a reply.
This screencast shows the use case:
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