But SitePoint has a button to reply 1.) at the top of the thread, 2.) as well as under each post, and finally 3.) at the end of the thread!
Are you saying that you don't like having a "Reply" button under each Post?
To me, it seems handy to have a quick way to post a message as you read for a few reasons...
a.) If a user is in "View All" message mode, it is a l - o - n - g way to the top and bottom!!
b.) Maybe a user is half-way down the page - in any view - and something they read inspires them to add a comment. Why not have a button or link right there in front of them to allow them to comment?
The easier I make it for people to comment, hopefully the more likely they are to do just that.
Having an "Add Comment" button at the top and bottom of the Comments section seems like a must.
However since I am tweaking some other things, I was wondering if adding a subtle "Add Comment" link under each Comment/Post would be a plus? :-/