In the faces display it shows the number of detected faces for each person.
I would find it convenient if it would also show, in brackets, the number of unconfirmed faces.
+1
1. This would probably cause a noticeable slow-down.
2. It might be useless anyway when the next IMatch release comes out.
3. The trick is to have zero unconfirmed faces. This keeps IMatch working very fast. Unconfirmed faces are not really helpful.
4. Based on 3: Showing 0 under each person will be not helpful.
An alternative might be to have an icon to show only unconfirmed faces. (Avoiding the complicated filtering).
But as Mario says - might not be important if we get (I assume) an elegant way to confirm etc. faces.