I noticed an issue with the thread participation history on the member profile page. When you create a reply to a thread, your reply is displayed in the participation history on your profile page. If you then make an edit to that reply, it appears as though the edit does not appear in the participation history on the original reply or as a new edit.
An edit to a thread reply does not appear in the participation history on the member profile page.
This is far from a major issue but I though I'd mention it.