It'd be nice to be able to mark a post as unread. Sometimes when I'm checking on things from my phone, I can't respond right away. The problem is that I'm human and forget to go back, sometimes. I think it'd be useful if there was an "Unread" link next to the other options (Report, Like, etc) which just makes it so the user's last thread view date becomes the second before the post was made. This should allow the thread to show up in the unread watched threads list which would be very beneficial.