Hi Twest and as always I thank you for your help, you are always very kind, thank you.
Yes, I am very familiar with the commercial version of Lite Speed Enterprise, which I have always used and use even now and unfortunately I am also very familiar with their price list :-)
As far as HTTP headers are concerned, these, if you wish, can still be modified using PHP, although this technique is deprecated and not preferred, and if you use WordPress for your websites there is a Free Plugin that allows you to do this also via PHP or .htaccess, allowing you, at least, to save a lot of time and it is called HTTP Headers https://wordpress.org/plugins/http-headers/ for WordPress.
I am also a fan of the Enhance Control Panel Developer Team and I admire them very much and I am also convinced that they are super fast and efficient in adding functions, fixing bugs (when there are any) and above all in following the requests of the Community.
I say this because to date the best Web Servers are only three and they are: Open Lite Speed (OLS) free version, Lite Speed Enterprise (paid version) and NGINX free version and it is for these reasons that I am increasingly convinced that if were able to implement the Persistent Configuration of the free Open Lite Speed (OLS) Web Server, many small and medium-sized companies would switch to using Enhance Control Panel, as would many Agencies that manage dozens or hundreds of websites for their clients as well as many users who manage all their websites themselves (dozens or hundreds of websites) as the free version of the Open Lite Speed (OLS) Web Server is ultimately almost comparable in terms of features and functionality to its paid Lite Speed Enterprise version but obviously without any license costs and with the advantage of still being able to use their excellent and free Lite Speed Cache Plugin for WordPress https://it.wordpress.org/plugins/litespeed-cache/ which obviously also works with Open Lite Speed (OLS) Web Server .
I also know that the excellent Enhance Control Panel Developer Team has already done a lot with the Free Open Lite Speed (OLS) Web Server, adding with the latest updates the ability to automatically reload the Free Open Lite Speed (OLS) Web Server every time the .htaccess file is modified and for this reason I hope that very soon they will also be able to perform the miracle of making the modification of the Free Open Lite Speed (OLS) Web Server Configurations persistent and this would be a unique masterpiece.