Need Help With A Rewrite Issue

You could do something like this to rewrite rules for author titles, check out the monkeyman rewrite analyzer to figure out, following code should be in your functions.php

add_filter('rewrite_rules_array', 'my_insert_rewrite_rules');
function my_insert_rewrite_rules($rules) {
   // Implement this function to add all the new rules to $rules array passed in
    $newrules = array();
    $authors=get_users();//http://codex.wordpress.org/Function_Reference/get_users
    foreach($authors as $author)
    {
        $author_slug = $author->display_name;
        $newrules["https://wordpress.stackexchange.com/".$author_slug] = 'auth=".$author_slug;
    }
    return $newrules+$rules;
}

Note: Above given code might not be exactly correct, I have written down steps to give you an idea of how it can be implemented, The rewrite analyzer plugin should help you figure out the rewrite rules(it pretty much tells you how your wordpress installation behaves for the various urls), play with it a bit to get a hang of it

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