The web interface of Zeroshell does not allow to set a Wireless Network card. For example it is not possible to configure the SSID of the wifi network. But if the Kernel has the module for the device that you have you could configure it by using the iwconfig shell command.
I haven’t a compatibility list of wifi card, but you could look in the 2.6.19 Linux Kernel to know if a device has the driver.
Zeroshell supports pcmcia devices, but you always have to check if the Kernel supports the specific device.
In the future, I hope to integrate the module ndiswrapper with which it is possible to use a network card by using the Windows drivers.