As the FTTC modem can be connected directly to a computer ethernet port, for non-BT broadband users is there any reason Internet Connection Sharing cannot be used through the ethernet switch/hub of the user's existing ADSL router?
If it can be used, what about the WAP? I have a feeling that needs the routing bit working, so DHCP to be disabled?
For those who already have gigabit switches feeding off their ADSL routers, then I imagine the ICS could certainly run through that with no router required? As could a WAP?
If any or all of the above is feasible, the "Pro" is the cost saving. Is there a "Con" re performance?