I wasn't sure how to explain it in the title so I'll explain it here.
I think it would be useful for when you flag a thread, to have an option to only receive the little green flag thingy when the original thread creator posts, or to just have it when anybody posts like it is now.
This is a great idea! It reminds me of Miiverse, as you only get notified when the original poster posts. I feel that this would be very useful, though it isn't completely necessary at the moment. It would be awesome if it was included in or after ACC 2.0, though! Awesome idea, Patrick!