Yes, i get what you mean
Essentially you want a new scene that is copied from a template scene without writing back to the template scene.
This can be done by placing a new menu item under "new scene" item called "new scene from template". When pressed, this will open a dialog of the scene file to clone from. This will clone everything in the scene to the new scene, but when it comes to saving, both save and save as will open the save dialog window to save the scene separately.
In the Asset Library scenes folder, we could make a templates folder, and when the "new scene from template" menu item is pressed, it will locate itself to the scene templates file location for quicker access to templates. This way you keep your templates organised, but it wouldn't stop you from loading a template file from anywhere else in the asset library/project library.
It is added to the user requests page.