$lastpostinfo['trimthread'] question

[WetWired]

From functions.php, line 500 or so:

function fetch_trimmed_title($title, $chars = -1)
{
	global $vbulletin;

	if ($chars == -1)
	{
		$chars = $vbulletin->options['lastthreadchars'];
	}

	if ($chars)
	{

So, you can either change it by finding 'lastthreadchars' in the options, or by passing a positive $chars parameter after the post info.