I noticed something very annoying with spot lights.
The trouble comes when you set the sadows colors differently than black.
As the shadow is only contained in the area of the cone of the spot
if you have for example a red shadow you get a nice red circle in the middle
of the scene…

Please check THIS THREAD for more info…

On the other hand few other people and myself discussed about this point
and, well, it may be true that in some cases this is usefull while in
other it's very disturbing…

So please NT that I don't see but that sees me,
could we have an option in the Light Properties Panel
to check yes or no to the extending of the shadow of a cone
to all the scene…

thank you