pull down to refresh

Sometime I find myself hitting the more button so often to look for that magical blue square notification that appears on posts I've been reading/commenting, to check if there are new comments. I know there's the subscribe-to-post option, but all those posts that I do not subscribe to, and get new comments, get lost in the queue.
Wouldn't be nice to have a radar tab for logged users that shows all read or commented posts that have new comments?
Something like this: