Disable the built-in code editor adding define('DISALLOW_CODE_EDIT', true); in wp-config.php

Anonymize login error message because it actually tells you what is wrong (the username or the password), hooking into login_errors with add_filter('login_errors, function() { return 'Login error'; });

Apply permission 400 (-rw-------) to wp-config.php

Change login URL avoiding the standard /wp-login.php or /wp-admin/ (pre)installing plugin "Lockdown WP Admin" or applying the same idea.

Block brute force (pre)installing plugin "Limit Login Attempts" or applying the same idea.

Mentioned plugins may be installed by default when Wordpress is installed through the APS, and may be added as an optional security measure by the Wordpress Toolkit.

What should this integration do?
- it should allow the sale of hosting subscriptions using a Woocommerce,
- it should be compatible with the Subscriptions plugin to charge monthly or annual payment. (https://woocommerce.com/products/woocommerce-subscriptions/)

Why You may want this integration?
- If you use Wordpress, it will be a simple and quick way to implement the payment for your hosting services.
- Woocomerce is the most popular e-commerce solution in the world. It is flexible and has a lot of integrations with other wordpress plugins. If you want to sell not only hosting, it may be a gold mine for you.

Email notifications to customers are sent on every available WordPress update, that's far too much. My clients don't take them for important anymore and don't update at all. I suggest to fine tune available settings in Tools & Settings > Notifications > APS application updates (customer’s digest): Different notification options if the available update is a WordPress Core update, a plugin update or a theme update. So for example the plugin and theme update notification could be turned off for customers, but WordPress core update notifications would be still sent.

Another suggestion would be an option to cutomize the FREQUENZY (= e.g. once a week, once a month) for sent digest mails, as it was already asked for in this here (and closed as already available, but it's NOT available):

https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/6034455-stop-wordpress-toolkit-emails-going-out-every-nigh
https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/6665897-wordpress-update-notification-e-mails-adjust-mai

WordPress has automatically fetch a cron job with each poll.
With nearly 1,000 users at the same time that it can render your server.
Even with a strong server.

It is possible in the configuration to disable the automatic cron job and outsource.

http://www.inmotionhosting.com/support/website/wordpress/disabling-the-wp-cronphp-in-wordpress

This could manually insert in Plesk.

I have so imagined that one among the WordPress settings applies the default value of the cron jobs for 10 min. And you can manually select this value from every minute to every day 1x.
So as in the previous Cronjob menu but just in the WordPress configuration of jeweilgen page.

That would be very relevant Performance Technically, even if only for a fraction of the customers.

Since Plesk the entries in the configuration automatically writes, you can also do this with embed and thus help many novice users and remove this annoying work administrators.

This task could possibly even a trainee working with them, because I think that this task is not particularly difficult. (Intricately she is, of course;))

It must be added only in the configuration this line:
define ('DISABLE_WP_CRON', 'true');

And as a cron job you fürgt then added:
Time: User: PHP interpreter: /var/www/vhosts/domain.tld/httpdocs/wp-cron.php

The cron job is permanently activated and starts each time you call.
As a result, that is already placed in the server weniegn users to its limit.
If the cron job is disabled in WordPress and inserts it as a cron job in the crontab this is a fundamental improvement.
When you install Plesk on this setting would be very good.

Implement VersionPress as part of your WordPress Toolkit. It uses WP-Cli and is Open Source.

By contributing to the project and having other devs already working on it, you will be able to amplify the speed of work being done.

Further, this project is the holy grail of WordPress development. People would literally flock to Plesk for this feature alone (not to mention its awesome in other ways).

Please seriously consider contacting the VersionPress Team. This Project basically takes the idea of Git integration, staging, and data syncing to the next level. Database changes are checked in to Git as text files where you can then resolve conflicts... you can literally edit the same post on two versions of the same site, and then merge the changes from both.

This would be a huge boon for Plesk and it already aligns nicely with the WordPress Toolkit... since it uses WP-CLI, you could simply make a GUI for it and help with the core code to speed up production.