Wordpress users management.
add, edit and resign Wordpress users

I would like to see the CPU and RAM usage by Wordpress applications.

I would also like to see a warning about slow php scripts, which would help to catch Wordpress plugins that use too many resources.

Would be great to have WordPress plugins to be able to have restoration points on a plugin upgrade basis and not only for WordPress major upgrades.

This way, WordPress plugins can be managed individually with more control over them.

Currently the Wordpress Toolkit interface is a bit messy with all the Wordpress instances of you and your customers.
It would be great if there would be the possibility so that you can mark and filter for certain Wordpress instances. Marking with stars could make it possible that the most important Wordpress instances always appear on the top and can be checked for updates and security issues very quickly.

By default, WordPress Toolkit creates instances with the same interface language as Plesk customer interface. Please consider adding the option to set custom default language for new instances.

WordPress Toolkit as the preview of the web-site uses the same sized images 1024x728 at any view settings such as list, titles and cards, also there is no cache for images. It might cause the performance issues such as slow load of a web-page.

Option to disable web-site preview, or smaller images for some regime such as list at which site-preview presented as thumbnail image around 130x100px would resolve this issue.

Add possibility chose what settings can be visible to end users.

I would suggest to let resellers determine what messages go to customers. Now all messages to customers come form the Plesk administrator. Customers don't have any direct connection to the Plesk administrator. Resellers do. I think all applications based communications and settings should belong to the resellers.

Allow service providers to set the number of wordpress installs possible for a client in subscription settings

Allow service providers to choose to enable/disable customers to create multisite networks

I would like to suggest an extra tab with only the plugins/themes which can be updated.
Checking what an "update all" does before hitting that link is a drag when one has pages full of plugins... Same for themes.

Add an option to WordPress Toolkit to disable wp-cron.php execution and optionally create a real cron job.
You would have to add:
define('DISABLEWPCRON', true);
to wp-config.php and than give the admin a choice to set up a cron job with custom times (e.g. every 10Min or 6h).

See: https://www.siteground.com/tutorials/wordpress/real-cron-job/

Similar to CloudFlare and BoldGrid, it would be great if there was a paid/subscription extension that allowed me to offer WordPress customers one-click installation of the JetPack (https://jetpack.com/) Personal or Premium plugin (with a negotiated volume or subscription rate).

Perhaps it could also allow customers to upgrade to Professional at their own cost.

My use case: I want to advertise that JetPack Premium is included with all WordPress hosting plans. However, they do not have any volume pricing, and a "one-click" plugin would be nice to handle the logistics.

We enforce keeping Wordpress up-to-date and would like to see the option to disable the "no updates" updating option in the Wordpress Toolkit. This would allow us to offer our customers the Security fixes only (minimum) option or all updates (maximum) update option.

Going to WordPress toolkit's Plugins view I get a listing of over 3000 plugins. It is quite hard to pick one-by-one the plugins that I choose to upgrade. It would be great to have a "filter" on that page, that I can only show the plugins that have updates available, hiding already updated plugins

The Wordpress Toolkit utilities in Onyx are awesome, but it would be pretty cool it could also check currently installed plugins/themes(versions) against the WPScan Vulnerability Database https://wpvulndb.com/ or some similar service so that known vulnerabilities could be highlighted, or automatically forced to be updated...