Thanks for another screen-shot.
Sorry, but did you say the screen-shots you attached are from a system YOU built, or just some off-the-shelf solution your company bought?
Does WordPress offer such a feature?
Back to my website...
How crucial do you think such a feature really is?
Where I am coming from, I don't mind people being able to edit a comment to an article within the first 5 minutes, but it is NOT my goal to provide a full-fledged CMS!!
I suppose it could help an Admin to see what someone initially posted (e.g. a naughty comment) and then reconcile that against what they changed things to (e.g. removed the naughty comment before they got busted), but at the same time, I am trying to attract those kinds of users to my website.
The goal is that people will be posting quality comments, and if they don't I will break their fingers!