Some questions

This will require customizations. There is no default field types that allow to create such menu.

This page display user records, and each user can have more then one product subscribed.
So should it display maximum expiration date based on all user's payments? Also what payment systems do you use? Some payment plugins set expiration date to 2039-12-31 for recurring payments, so such info will be useless.

ok. Edit /amember/plugins/db/mysql.inc.php and change this function:

PHP:

    function get_users_list($pattern='%', $status=-1, $start=0, $limit=-1, $aff_id=0 ){
        $where = $having = "";
        if ($pattern)
            $where = " AND u.login LIKE '" . $this->escape($pattern) . "' ";
        if (strlen($status)){
            $status = intval($status);
            if ($status >= 0 && $status < 3)
                $where .= " AND status = $status ";
            else if($status == 3){
                $where .= " AND is_affiliate>0 ";
            }

        }
        if($aff_id ){
            $where .= "AND u.aff_id = '$aff_id'";
        }
        
        
        $limit_exp = $this->get_limit_exp($start, $limit);
        $q = $this->query($s = "SELECT u.*,
            SUM(if(p.completed, 1, 0)) AS count_of_completed,
            SUM(if(p.completed, p.amount,0)) as summa_of_completed
            FROM {$this->config['prefix']}members u LEFT JOIN {$this->config['prefix']}payments p ON (p.member_id=u.member_id)
            WHERE 1 $where
            GROUP BY u.member_id
            HAVING 1 $having
            ORDER BY u.login
            $limit_exp
        ");
        $rows = array();
        while ($r = mysql_fetch_assoc($q)){
            if ($r['data'])
                $r['data'] = $this->decode_data($r['data']);
            $rows[] = $r;
        }
        return $rows;
    }


to

PHP:

    function get_users_list($pattern='%', $status=-1, $start=0, $limit=-1, $aff_id=0 ){
        $where = $having = "";
        if ($pattern)
            $where = " AND u.login LIKE '" . $this->escape($pattern) . "' ";
        if (strlen($status)){
            $status = intval($status);
            if ($status >= 0 && $status < 3)
                $where .= " AND status = $status ";
            else if($status == 3){
                $where .= " AND is_affiliate>0 ";
            }

        }
        if($aff_id ){
            $where .= "AND u.aff_id = '$aff_id'";
        }
        
        
        $limit_exp = $this->get_limit_exp($start, $limit);
        $q = $this->query($s = "SELECT u.*,
            max(if(p.completed, p.expire_date, '')) AS expire_date,
            SUM(if(p.completed, 1, 0)) AS count_of_completed,
            SUM(if(p.completed, p.amount,0)) as summa_of_completed
            FROM {$this->config['prefix']}members u LEFT JOIN {$this->config['prefix']}payments p ON (p.member_id=u.member_id)
            WHERE 1 $where
            GROUP BY u.member_id
            HAVING 1 $having
            ORDER BY u.login
            $limit_exp
        ");
        $rows = array();
        while ($r = mysql_fetch_assoc($q)){
            if ($r['data'])
                $r['data'] = $this->decode_data($r['data']);
            $rows[] = $r;
        }
        return $rows;
    }


Then in /amember/templates/admin/users.html you will be able to use this valiable within {foreach from=$ul item=u} cycle:
{$u.expire_date}