magento-make-admin.php

<?php

include 'app/Mage.php';
Mage::app('admin', 'store');

$password = substr(md5('Password' . time()), 0, 16);

$user = Mage::getModel("admin/user")
    ->setData(array(
        'username' => 'steve',
        'firstname' => 'Steve',
        'lastname' => 'Robbins',
        'email' => 'steven.j.robbins@gmail.com',
        'password' => $password
    ))
    ->save();

$role = Mage::getModel("admin/role")
    ->setData(array(
        'parent_id' => 1,
        'tree_level' => 1,
        'role_type' => 'U',
        'user_id' => $user->getId()
    ))
    ->save();
    
echo $password;