Hi. I designed PadOrbiter.
(1) no, there isn't. PadOrbiter is set up to work out of the box, with the internal network being 192.168.80.1 ... If you wish to change this, you will need to attach a keyboard to the USB port, press ctrl-alt-F1, and log in with root/root, and manually change the IP address of your dcerouter in /etc/hosts.
(2) I have looked, and can't find any PCMCIA cards anymore that fit into that form factor to attach the antenna externally.
WEP was a compromise, because the WPA2 support in the 350's linux driver is horribly broken, and I was never able to patch it or the firmware to get WPA2 support working.