[Admin]

You can just replace this:

$threadengine = $DB_site->query_first("SELECT enablewysiwyg FROM user WHERE userid='$bbuserinfo[userid]'");

  if($threadengine[enablewysiwyg]){ eval("dooutput(\"".gettemplate("newthread_wysiwyg")."\");");

  } else { eval("dooutput(\"".gettemplate("newthread")."\");"); }

With:

  if($bbuserinfo['enablewysiwyg']) {
     eval('dooutput("'.gettemplate('newthread_wysiwyg').'");');
  } else {
     eval('dooutput("'.gettemplate('newthread').'");');
  }

No query needed.