[Andreas]

Having thread A redirect to thread B (instead of getting deleted after the merge) is pretty easy:

In postings.php FIND

PHP Code:

$DB_site->query("DELETE FROM " . TABLE_PREFIX . "thread WHERE threadid = $mergethreadid"); 


REPLACE that with

PHP Code:

$DB_site->query("UPDATE " . TABLE_PREFIX . "thread SET open = 10, pollid = $threadid WHERE threadid = $mergethreadid"); 


However, redirecting to a specific post is difficult, as there are no built-in ways to do so.