I stumbled apon them whilst looking for something else...
Each connection setting is stored in its own file in /home/zaurus/Applications/Network/modules
Thus, if you fiddle with a file in one place, you need to be sure to keep the /etc/pcmcia files consistent.
Moral: if you use a GUI for configuration, keep using it, and only tweak the config files if absolutely necessary. As far as I can see, the only time you need to do this is to turn on WPA.