This script will apply one 1x1x1 meters UVW-Map modifier in box mode to each selected object with a normal click.
Regardless of system unit type the size will always remain 1x1x1 meters.
If shift-clicked, it will apply a real world map size UVW Map modifier instead.
I use this frequently in architectural visualizations for applying a standard uvw map to most of the objects.
Only tested with 3ds max 2013!
I am not responsible for any damage caused by this or any other of my scripts to your scene, software or computer.