Nice idea. I think some of the fun of UFO is that you don't know how far the closest alien is. But this is no problem, just introduce some randomness. Say, 1 in 10 on average, the landing zone is of a totally different type than advertised. I also think for diversity, some maps sould let you choose their versions with close or distant spawn spots, while other should only tell you which variant this is. Again some might by silent...
I wonder how this relates to the current mission and map scripts...