I built this a while back for sedito and only released the code for it recently, I'm pretty sure it's been done before but I never found anything on it.. EDIT// This feature is now a PLUGIN!
This plugin masks the actual post id, and in exchange, starts each thread off with Post #1. The first reply would be Post #2 and so on.. This works with multiple pages, does not change the link to the post, and very minimal code is used. The code added/changed is as follows: EDIT// This is the new code used inside the plugin.
"FORUMS_POSTS_ROW_IDURL" => "<a id=\"post_".$row['fp_id']."\" href=\"".sed_url('forums', "m=posts&id=".$row['fp_id'])."\">".$idmask."</a>",
For whatever reason, PFS is still not working for me on cotonti.com. So here it is, RapidShare yet again. :(