Perfect idea. I've encountered so many instances where people misinterpret the tone of the post thus end up in a fiery discussion over a trivial matter.
However this should not only be limited to threads though, users should be able to choose their mood in their posts as well.
Something like Facebook's style would work wonders.
Liberty feeling (mood) (emoji) 3 days ago
(Post content)
Liberty feeling excited 😃 3 days ago
It's a private discussion on esoTalk so it shouldn't be too difficult to find.
If you did not choose any feelings or mood, no mood will be displayed:
SeeD 2 days ago
Perfect idea ...
If you're feeling like a joker
SeeD feeling cheeky >=) a few minutes ago
lalalalalala
Discussions will become more lively. (Y)