How it is coded now you can easily add multiple networks manually for your pi to remember if you’re taking it to a friend’s house with a different network:
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
just add the following lines at the end for each new network (WPA/WPA2):
network={
ssid="NETWORK_NAME"
psk="NETWORK_PASSWORD"
}
for different encryptions like WEP you can see the wiki
As far as integrating it as an option in the setup script you can open up a ticket on github