[MarkFL]

One thing you could do, is edit your postbit template (it may be "postbit" or "postbit_legacy" depending on which you use), and locate the code:

<vb:if condition="$show['postedited']">

and change it to:

<vb:if condition="$show['postedited'] AND $post['editlink']">

This way, only those who can edit the post will see that it has previously been edited. This will however, not allow other non moderator users to see if the OP has edited the post.