You'd need to modify the postlist script to change the default sort order to alphabetical. Somewhat outside the scope of this forum so you might check at ubbdev for more help, but for a nudge in the right direction, you'd be looking to add some code to that script that would look something like this to postlist where some of the other variables are being defined. # would be changed to the actual forum id of that particular forum

PHP Code

if ($Board == "#") {
   $sort = 1;
   $order = "asc";
}