In the UI, at Tools & Settings > Update Settings, it is possible to set a notification to be sent when updates are available or were installed.

In the UI, it is possible to set the notification to be sent either daily or weekly. However, the corresponding CLI option plesk bin notification --update -code adminpumupdates has no option to set the notification frequency. Please add an option to set it via CLI as well.

Please add feature to change type of notification (do not notify, errors only, every time) about scheduled task completion via CLI with plesk sbin crontabmng utility
Currently, to change such notifications (via CLI) not only values in database need to be changed but also values for SendMailOnlyIfFail option in C:\Program Files (x86)\Plesk\Schedules\psaadm, C:\Program Files (x86)\Plesk\Schedules\Root files.

Such steps are not ideal while changing the settings for a large number of servers.

I only use Plesk for mail hosting and there is too much junk I do not need. I would love to see an email-focused Plesk version that provides all the necessary tools to have the best email hosting panel and appropriate licence. No WordPress or other server tools. Just focus on email security delivery and management with a special licence.

Add the option to display (view) images of .webp format via the File Manager view/editor.

Add the possibity to convert a Folder to an IIS application in Plesk Panel.

automated logout happens in phpMyAdmin even if i am continuously checking sql commands in phpMyAdmin , the editted sql commands are lost and effort gone waste
logout should happen only in case of the phpMyAdmin console is idle for certain time say half an hour

Linux crontab syntax is not fully supported in Plesk for windows. For example, entering the following cronjob:

*/1 14 * * 1-5

results in an error:
Slash (/) and hyphen (-) are not allowed.

Adding such functionality would be great.

Log files saved in separate files in folders by the name of domain GUID. It is quite difficult to find the domain which is involved in malicious activity. It would be good to have the ability to keep the log file for all the domain as a common file like error.log in Linux web server.

It'd be great to have an option to secure mail on the domain automatically by the means of a service plan.

Could you please add the option to calculate .trash folder in Home directory of the File Manager (so when calculating the size of all contents of the domain you can choose the checkbox of the ".trash" folder)
Main reason is that before the .trash bin was implemented in Plesk the size of the Home direcory calculated in File Manager (more > calculate) matched with the amount disk space used in Statistics

It would be great if this was optional (for example can be configured for some the customer via panel.ini)

Before suspension intimate the customer for the fault and give time to rectify. so that the website be in running mode. if customer still not resolve problem in given period then suspend or disable the website.

but your people just suspend or disabled the hosting or domain without intimating to customer that not good.

If something goes wrong on the main domain of the subscription it would be nice to reset the domain to a clean state without removing or restoring from the backup.

Staging domains would want to either block all IP addresses except for a few (developers and clients) or redirect to the production site.

Add ability to change the domain name in links from the mail notification that's being sent upon creation of the new "Customer" in Plesk. It would be nice to not expose our Plesk hostname and instead use for password reset link some other domain name, that resolves to our server.

There is a possibility to create a subfolder for the inbox folder of the email account via CLI.
For Dovecot, for example, with the following command:

doveadm mailbox create -u email@example.com -s INBOX.newfolder

It would be nice to have an option to create such folders via Plesk UI.

Plesk interface should inform that in order to check Web Statistics it should use the FTP credentials. User's may think that they can use Plesk admin/reseller/customer login credentials. For example showing that information when hovering with mouse cursor or adding some info box

Will you do support for clearlinux?