This is a feature that needs to be brought to the Plesk Control Panel.

This request has been outstanding since Plesk 10:
http://kb.parallels.com/en/113938

This wasn't possible in Plesk 11.5.
http://kb.parallels.com/en/121606

It still does not appear possible in Plesk 12.

At the very least, breaking a domain out into its own subscription would be a good first step.

Search words:
I cannot move domain to another subscription
move webspaces
move a domain within a multi-domain subscription
multi-domain subscription
migration manager
transfer a domain
separate subscription
split subscription
break out domain from subscription

I'm wondering if Plesk also will implent HTTP Strict Transport (or HSTS) Security in the GUI. It's an extra layer of security for sites who need to be extra secure.

It's being done with a special header (mod_headers for Apache) and a TLS connection. The client (browser) can then verify if the server is the real server and not a man-in-the-middle server/attack.

It's as simple as adding the following code to the vhost config (HTTPS only!):

Apache:
Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"

Nginx:
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains";

As descriebed earlier

I'll like to create a hosting that only use Nginx as webserver. Also I'll like to do this with Node.js, but I think it will not be approved.

It would be nice to provide mail SSL/TLS support with SNI for more domains from single IP

It would be useful to have options for what additional administrators can do within the panel. For example, I run hosting as part of my IT company and normally it's me that does all the work in Panel, however it is often useful to have one of my staff to do some admin tasks but I don't necessarily want that person to be able to perform all tasks such as changing critical server settings.

Ask user to change password at next login screen after reset.
We the providers could generate a temp password (customer asks for a reset), and after the first login screen, plesk will force ask from the client to change our temp password.

Add support of TLS 1.3 to Plesk interface's web server. TLS 1.3. improves security.

Nowadays, many users are using IMAP, maybe because is the default setting in many popular email clients (Mozilla Thunderbird, and I remember Mail on Windows 8.1 didn't support POP3 at all).

Mail content usually grow but previously stored messages doesn't change often. In Maildir format, used by Plesk, qmail and Postfix, when an user got new mails, new files with unique name are added on disk, and only some files are changed (basically, only courier-imap and dovecot caches and indexes, perhaps easy to rebuild from scratch).

So, please, support incremental backup for mail content too

as per:
http://forum.parallels.com/showthread.php?290993-missing-feature-change-multiple-email-settings

In 9.5.4 it was possible to select multiple mailboxes and change their settings simultaneusly.
This is now suposed to be done through subscription plans, but there are certain settings not contemplated.

For example, in a 300+ mailboxes domain I want to change each mailbox antispam setting to "move spam to spam folder" and this is not possible though the panel and I need to make a script to do it through shell.

I would like this feature to come back, like it was in 9.5.4

Since we are now able to create more than 1 Administrator within Plesk - it would be a good addition if one would be able to give those Admins particular Rights within Plesk.
I don't want my "Everyday-Admin" to be able to stop Services within Plesk or even Shut-Down the whole Server within the Panel ...

I want them to do their work with Customers/Domains/Hostings ... but access to the "real Admin Areas" should be restricted ...

Please provide a Forget Password Option for mail users. It will be work through SMS or alternet Email.

Just a Button to send customers an Email with new Password etc

There are many customers complaining, they have to try several passwords during the password-reset process, before one is accepted. There is no visual indicator if the typed password fits the safety regulations.

"Inside" plesk, the password strengh is indicated when they change theirs plesk- , FTP- or e-mail password. Why not during the reset-process?

The highlight would be an indicator, that permanently shows if the typed password is strong enough or has to be stronger (with a tooltip/hint, what specifications has to be met or which kind of character is missing).

Web Deployv.4.0 was installed on the server before Plesk.
Now WebDeploy is displayed as installed in Plesk installer.
However, it is not detected by Plesk in Tools & Settings > Server Components(Refresh does not help either).

Please add support for WebDeploy 4.0