It would be great to not have an ability to install Plesk on a system that is using a component (database server, e.x.) that is not supported by the Plesk version.
Please consider implementing the functionality of the pre-install checking of unsupported components. It can prevent issues with Plesk on the servers with unsupported software.
Such an idea has already been provided once, however, it was too specific (for database servers only): https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/20166910-prohibit-installation-on-unsupported-databases.

At the current moment it is not possible to re-send Plesk notifications about creating domain\customer account because they are triggered by specific events.

But there is a chance that this email could be deleted by user accidentally.

Would be helpful to have a functionality to re-send email notifications in Plesk.

Currently, parameters passed to the custom button URL are put there in plain text (even FTP user password).
As the custom button URL is using GET request, the parameters can be easily replaced by anyone which is not secure and doesn't allow using custom buttons for logging customers into a third-party service (e.g. billing).
Please consider implementing an option to securely encode URL parameters so only the receiving side can decode them.

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

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

From the hosting service, to have access to the domains and websites that are within the subscription.

Due to security reason users may need to ability to protect their archives with password. Currently there is no ability to extract or create such archive. Please, add

It would be nice that you can sort on 'Valid to' with in the advisor section secure websites with ssl/tls certificates.

With current version, to get all subscriptions that will expire soon must request all subscriptions, include the limits dataset, and then perform a filter.
Leaving the possibility to filter by expiration date will be a greate improvement.

I should be able to remove a subdomain, keeping all its files and folders. eg:

• dev.mydomain.com Root directory: /mydomain.com
• www.mydomain.com Root directory: /mydomain.com

Currently if I remove the subdomain, I'm told that all its relevant files will be removed, BUT, it is in use by the main domain. I need the assurance, and a checkbox to KEEP the root directory and all associated files.

Limit the FTP Access to a specific IP range or IP for a specific subscription:

Ex:

Example.com / IP 10.0.0.1 allow only connection between 10x to 30x IP

Ability to use the tab key on the keyboard to navigate through a menu and select items by using keys such as arrows, Enter, Space
For example, in the section Add/Remove Components

Preconfigure usage of socket for mysql due to latency and performance on local host usage.

I would like to suggest the feature move scheduled task created under a subscription level to another subscription.

With Linux, it's possible to modify /var/spool/cron/crontabs but windows such changes it not possible.

Thank you.

license key grace period warning should not show to customers and resellers

Currently warning shows to all the users in plesk panel.

which is suggest to show only admins.

Login and go straight to the domain page instead of the Home page.