There is a free open source java utility to configure Airport Snow/Graphite base stations:
"Airport Base Station Configurator"
http://gicl.cs.drexel.edu/people/sevy/airport/
This is a java application. Make sure you download the UNIX/Windows version, NOT the Mac Classic version.
To run it, you need to unzip the package first. This will create a folder called 'configurator_20'. Then in a terminal (/Applications/Utilities/Terminal) type 'java -jar /Where/You/Unzipped/The/Package/configurator_20/Airport2BaseStationConfig.jar'.
Hope this helps.
Wouter 😉
PS: While this is a fully functional workaround, I really hope Apple releases an update to their application.