Unfortunately I have a feeling about the answer: this is not possible, the forum provider will need to add it... but let's try:
Currently when posts that were moderated are put back to the forum, they appear whenever they were posted. I.e if it was posted a few days ago then maybe in the 2nd/3rd page, if it was a month ago then good luck finding it.
IMHO posts that are freed from moderation should be available in the 1st page. I'm not sure what's the best way to do it. The easiest probably is to change their dat to "now", but probably a better solution would be not to change the date (what happens if I free a post that was moderated 2 years ago...) but have another way to make this happen.