So actually I think this is potentially a real issue...
Leaving replies I think should be really simple... maybe I'm use to FaceBook feed or something..
But users can't "Reply" where they see the comment... (the homepage/search results page looks exactly like the individual topic page, so it seems like you can)
Also Admins can reply on the homepage, so assuming it'll make sense for User's to be able to reply quickly as well...
Customer support service by UserEcho