[necris]

Thanks for the info.

Finally I came up with a solution to the problem after lurking a little in the settings table of the database (easier than expected ^^ because it have a non caotic structure).

Here i leave the code just in case anyone need it.

$counter_aux=preg_match  (  '/device\.domain\.com/' , $_SERVER['HTTP_HOST']);
if($counter_aux<>0){
        $vbulletin->options['forumhomedepth'] = 2;                $vbulletin->options['forumdisplaydepth'] = 2;
        $vbulletin->options['subforumdepth'] = 0;
}

On the hook global_setup_complete.