Given that I frequently have to jump to the first post and back in order to understand the context of the post I jumped to, I think this might be a worthwhile UI improvement. The process bar is good for checking the topic title on mobile, but the second tap to jump to first post might me one too many. And, more importantly, it’s too difficult to find for new users.
So how about putting that button exactly where admins see the wrench (and next to it for admins)?
