I wanted the UI to stay simple, and stay neutral to what the cameras are used to look at. So catering to this specific case of spawning a camera when an enamy attack alert occurs sounds outside of the scope of this mod. Considering it would require making an entirely new UI to configure when and how the cameras ares spawned.
What I could do though, is add some remote API for creating/destroying camera windows. So another mod or a scenario script can act as an extension to Windowed Cameras to implement what you want, which is something like "when an entity is damaged and it is caused by an enemy force, create a camera window on the bottom-right corner of the sreen for every player the entity is the same force with". How does that sound?