Turns out that libicd-network-ipv4.so isn't used by the GPRS plugin after all and can therefore be considered part of the WiFi stack.
It accesses the following gconf keys:
/system/osso/connectivity/IAP/%s/ipv4_autodns
/system/osso/connectivity/IAP/linklocal_wlan_infra
/system/osso/connectivity/IAP/%s/ipv4_dns1
/system/osso/connectivity/IAP/%s/ipv4_dns2
/system/osso/connectivity/IAP/%s/ipv4_dns3
/system/osso/connectivity/IAP/%s/ipv4_type
/system/osso/connectivity/IAP/%s/ipv4_address
/system/osso/connectivity/IAP/%s/ipv4_netmask
/system/osso/connectivity/IAP/%s/ipv4_gateway