Change stylevar with plugin

[postoronnim]

This is an old thread), but maybe someone will search the answer and not find, like me.
Now you can change a stylevar in a plugin with the 'fetch_template_complete' hook. For example:

if (THIS_SCRIPT == 'css') {
  $vbulletin->stylevars['forum_sidebar_width']['size'] = 236;
}