We have put together a short survey to capture your feedback in terms of what BT can do when you experience home Wi-Fi issues. We would appreciate it if you could take a couple of minutes to complete a short survey. Read more from here, Fix my home Wi-Fi
Why are you asking about option 61 which is relevant to Sky on a BT forum?
Nope, BT authenticates using PPPoE and generic login details as it authenticates against your phone number.