[miz]

ok for the mysql addon look on this code from functions_newpost.php

$DB_site->query("
				INSERT INTO " . TABLE_PREFIX . "thread(title, lastpost, forumid, open, replycount, postusername, postuserid, lastposter, dateline,
					 iconid, visible, attach, similar)
				VALUES
					('" . addslashes($post['title']) . "', " . TIMENOW . ", " . intval($foruminfo['forumid']) . ",
					 1, 0, '" . addslashes($post['postusername']) . "', $bbuserinfo[userid],
					 '" . addslashes($post['postusername']) . "', " . TIMENOW . ", $post[iconid], $post[visible],
					 $totalattachments, '" . addslashes($similarthreads) . "')
			");
			$threadinfo['threadid'] = $DB_site->insert_id();
//############## now insert new post###########################
$DB_site->query("
			INSERT INTO " . TABLE_PREFIX . "post
				(threadid, parentid, title, username, userid, dateline, pagetext, allowsmilie,
				 showsignature, ipaddress, iconid, visible, attach)
			VALUES
				($threadinfo[threadid], $parentid, '" . addslashes($post['title']) . "',
				 '" . addslashes($post['postusername']) . "', $bbuserinfo[userid], " . TIMENOW . ",
				 '" . addslashes($post['message']) . "', $post[enablesmilies], $post[signature],
				 '" . addslashes($post['ipaddress']) . "', $post[iconid], $post[visible], $totalattachments)
		");
		$post['postid'] = $DB_site->insert_id();

// ######### update thread with post id ###########

	$DB_site->query("
				UPDATE " . TABLE_PREFIX . "thread
				SET firstpostid = $post[postid]
				WHERE threadid = $threadinfo[threadid]
			");

now, all you need to do is to replace the vars and thats it
about the user id, you can add user called bot take his userid and use it
or you just can add fake userid like 999999 or something