I think that when you go to "Replay and analyse" a game, you should be able to comment on specific moves, so that others may see it. Kinda like niconico, if you get what I mean.
There already is a section of the forum, however, which works well enough, and I suspect that what I've suggested may take a good amount of programming, as well as causing problems with games still in
progress where the players take back a move or two. The benefit may be underwhelming in comparison to the work required, but I thought I'd just throw the idea in for consideration. And if someone's
already suggested this, sorry for the extra post.