This script makes a selection in the viewport based on which UV shell is selected in the unwrap UVW modifier. See the tutorial for a better explanation.
Installation: Just drag and drop the script into the 3ds max viewport. Then go to Customize > Customize Interface > category: waRp Tools > Make a selection from the selected UV shells
It was only tested in 3ds max 2013
If you like all of the scripts that are in the tutorial you can download them by clicking the warp_tools_bundle.rar in the attachment
I'd like to thank DenisT(Denis Trofimov) from http://forums.cgsociety.org for helping me out with this script