Since Plesk Obsidian RC4, users’ Microsoft Outlook and Thunderbird mail clients can now be automatically configured based on entered emails.
This is something the community really is waiting for. Most end-users find it too difficult to setup e-mail accounts.
Maybe Plesk will respond if we create a new change request, instead of posting comments to this old one.
Please add this feature.
Since Plesk Onyx you will be able to install memcache as a Docker container and configure http(s) proxy rule for it to map to your web app.
Docker and proxy rules are available in Plesk Onyx Preview already, you can try it here https://talk.plesk.com/threads/plesk-onyx-preview-and-feedback.337172/