The hard thing would be to check if a trade really happened, because otherwise someone can have fake feedbacks.
Are you using a plugin for trading?
Moderator / Admin messages
Moderator / Admin messages - It would be great if administrators / moderators could added messages to a post. This would could be used to explain why a topic had been moved or forked or even to warn that a post is a duplicate or perhaps explain why its been locked.
If this could be created or if it exists already please let me know
@william.owen so some sort of comment function?
I personally prefer classical edits.
Editing the post is open to the OP so moderator messages could be faked or changed. Moderator comments would be a fairly good way to put it perhaps, but they would be surfaced as part of the OP not further down the reply thread.