I haven't tested it at all, but I think maybe you could modify the query in packages/vbcms/widget/recentposts.php around line 422 to look like this:
Code:
WHERE 1=1
$forumsql
$associatedthread
AND thread.visible = 1
AND post.visible = 1
AND thread.open <> 10
AND post.dateline > $datecut
AND thread.firstpostid <> post.postid
$globalignore
$ignoresql
(the part in red is added). Of course that will change all Recent Post widgets.