I Personally Use rewrite_rules_array Function During My Own Wordpress plugin. However I Have Same Problems. Here's My Code.

function addGoRewriteRule($rules){
$newrules =  array('go/([^/]+)$' => 'index.php?go=$matches[1]');
return $newrules + $rules;
}
function goInsertVars($Vars){
array_push($Vars,'go');
return $Vars;
}

But I am unable to Read My go vars. Somebody possess a idea ?

Thank You For Help.