??Not sure I understand your comment.
When I log out of the forum, then log back in, it only shows as new the posts made during the time I was logged out.
If you are not logging out each time (I almost never do), you could use the "mark forums read" link at the bottom of the page.
In any case, there is nothing the mods can do about the way the forum software works. That is up to js (admin/owner), as he is the only one with access to the vBulletin controls and software.