It isn't possible as standard, though you could do it by modifying the core redirect() function found in ./inc/functions.php
Here's a quick example of something that MAY work - though I haven't tested it:
/**
* Redirect the user to a given URL with a given message
*
* @param string The URL to redirect the user to
* @param string The redirection message to be shown
*/
function redirect($url, $message="", $title="")
{
global $header, $footer, $mybb, $theme, $headerinclude, $templates, $lang, $plugins;
$redirect_args = array('url' => &$url, 'message' => &$message, 'title' => &$title);
$plugins->run_hooks("redirect", $redirect_args);
if($mybb->input['ajax'])
{
// Send our headers.
@header("Content-type: text/html; charset={$lang->settings['charset']}");
echo "<script type=\"text/javascript\">\n";
if($message != "")
{
echo 'alert("'.addslashes($message).'");';
}
$url = str_replace("#", "&#", $url);
$url = htmlspecialchars_decode($url);
$url = str_replace(array("\n","\r",";"), "", $url);
echo 'window.location = "'.addslashes($url).'";'."\n";
echo "</script>\n";
exit;
}
if(!$message)
{
$message = $lang->redirect;
}
$time = TIME_NOW;
$timenow = my_date($mybb->settings['dateformat'], $time) . " " . my_date($mybb->settings['timeformat'], $time);
if(!$title)
{
$title = $mybb->settings['bbname'];
}
// Show redirects only if both ACP and UCP settings are enabled, or ACP is enabled, and user is a guest.
if($mybb->settings['redirects'] == 1 && ($mybb->user['showredirect'] != 0 || !$mybb->user['uid']) && (THIS_SCRIPT != 'search.php'))
$url = htmlspecialchars($url);
eval("\$redirectpage = \"".$templates->get("redirect")."\";");
output_page($redirectpage);
}
else
{
$url = htmlspecialchars_decode($url);
$url = str_replace(array("\n","\r",";"), "", $url);
run_shutdown();
if(my_substr($url, 0, 7) !== 'http://' && my_substr($url, 0, 8) !== 'https://')
{
header("Location: {$mybb->settings['bburl']}/{$url}");
}
else
{
header("Location: {$url}");
}
}
exit;
}
Notice the part that reads
&& (THIS_SCRIPT != 'search.php')
That basically should disable the friendly redirect on any page relating to searching. As I said, it hasn't been tested, but that's the way to go about doing what you want to do. Also, i'd advise using the patches plugin by frostschutz in order to make core edits as you can then enable and disable the changes you make more easily.