This mod adds a hot key (default: Shift + Z) to zoom out very far. The zoom level is customizable as a player setting.
There are already similar mods with the same or more functionality. This one is both simpler and it is also my attempt at learning mod settings.
BROKEN Unfortunately the game API no longer allows setting the zoom level beyond what regular gameplay allows. This thread indicates that the developers might consider reallowing the previous behavior in the future.