If you want it in your game, it has to exist somewhere. The layout is pretty much the only place it can exist... so what do you suggest?
You know how things exist in the layout without being on screen, like the Mouse & Keyboard object? Something like that. If the object is created (or spawned) somewhere in the event list it shouldn't have to be in the layout, but perhaps it's just a matter of habit.
Why would you want to remove it? What if you then need to edit it or its properties?
It's just that I like things clean and don't want anything on the layout other than the things I want there at the start of the frame. I understand it's not a REAL issue since the object will never be visible in the game. It's just something stuck in me, like how you structure your code in regular languages.
Editing the properties of an object not in the layout should be possible (EDIT: is already possible) via the objects-list to the left of the layout screen.