Exluding Files/Folders from a Update
Make it possible to exclude specific files or folders from changes by some update. Such as my.cnf as an example.

This cannot be done for various reasons. The example "my.cnf" is part of MySQL or MariaDB. An update of such a service is controlled by yum or apt. Blocking file access to such files will break the update process. On the other hand, Plesk is not touching such files on Plesk updates at all, so there is no need to implement a file exclusion feature for updates. For files that Plesk updates during a product update, it is essential that settings in such files are changed, else the product update will fail or the product won't be operational after the update.
The bottom line is: Implementing this feature will break a lot of things while the benefits are non-existent. We must decline this request.
-- PD