Would be great to have an option to create a staging site for other CMS/Applications, similar to what is offered in WP-Toolkit for WordPress.

For example for Shopware, etc

I suggest adding functionality to restore a domain or subscription from a server-wide backup on the Plesk server, where this domain or subscription is missing (for example, it was deleted before). This is very inconvenient when you have to create a nonexistent subscription, then restore it, and then separately restore the domain in it.

Add a feature to enable OSCP stapling for webmail of domains that will increase webmail security.

This feature is already available for domains in the SSL It! extension.

Active and Pasive domains and hostings must list seperatly. When i list domains, only active domains must be listed, when i choose a combox "pasive domains" or "all" then pasive domains must be listed

Not sure how can this be implemented but mailboxes getting full from messages(spam) that gmail does not download

It would be nice if there is a way to auto clean undownloaded messages after a while

Please add Key fields to business objects in Plesk that Administrators and Resellers can edit. It's a must have feature to simple and safe find the correct objects!

Customers - Customer Number
Abonnements - Contract Number
Abonnements Addons - Contract Number
Resllers - Customer Number
Domains - Contract Number

..... and so on.

This is a very important feature for automation

Currently, Plesk only provides the option to include a single domain on a Certificate Signing Request (CSR): https://support.plesk.com/hc/en-us/articles/213939845

According to our business needs, we need to issue a CSR with alternative subject names, we need to include multiple domains on this CSR so we can issue a SAN certificate, but Plesk doesn't have such functionality.

Enable user to change Contact name or replace contact name with company name as IT incharge not forever the same person.

Is there much more to say? Language is important.

Extensions display which versions of Plesk & OS they currently run on without clicking on them. If the list is shorter, maybe indicate which OS or version of Plesk they don't currently work with. For example if considering jumping to Plesk Obsidian on CentOS 8, from 7.x, it becomes significantly easier to determine if a plugin currently in use is available on the intended platform.

It would be good an option to disable webmail for a specific mailbox instead of the whole domain in cases where we do not want someone accessing the account outside of their workplace.

when sending alerts about high load of server, i think it would be a Good idea to receive some kind of snapshot of processes list, maybe not the full list but at least first 10 or 20 heavier processes

In the meantime you receive email and go to panel to see what is happening. things goes back to normal

Ability to declare an Alias of multiple IP address and use it to allow access through the Firewall.

I.e. I have several "management IP" and I want to allow access to Plesk Panel, Plesk Installer and SSH to them only.
It will be easier to declare who they are one time only and, in future, update them in one place as well.

while somewhat noob friendly the current docker plugin is just missing pretty much every feature to make it useful for anyone else than a hobbyist.

Portainer is multitudes more powerful and feature rich to serve the power users, for example being able to set up networks and swarms

It would be useful to be able to remove from a server-wide backup only particular domain's data (such as mailbox accounts) as it will help to manage server's disk space in a more efficient way and store only needed data

Ability to add/upload additional/custom SpamAssassin files (.cf) inside Plesk Email Security extension. It will increase the spam security level.

Although there is Website Importing function in Plesk for subdomains, there is no Mail Importing function.
Please add Mail Importing feature for subdomains in Site Import extension.