I found a way to meet your requirement. You can choose white list but leave the keyword blank, so the modem don't have any website to allow for internet, which means all website will be blocked....

This modem doesn't support bandwidth control but only has a function called QoS. You may refer to the link below to get some idea. http://www.tp-link.com/en/faq-537.html

From the status of DSL, I can tell your line status is very bad.Besides, the dsl link speed only has 3-4mbps. That's the reason why the speed is slow. The SNB margin and attenuation are very high....

What's the model number of N300? You can reserve an IP for the sonos by DHCP-DHCP Reservation option on the router's management page. The login address and login account can be found on the bottom...

Chines version can't upgrade to English version, because they use different chipset. You can contact Chinese support on the package for help. They may understand English.

TD-W9970 doesn't support 56 delegation. You can contact support.uk@tp-link.com and ask tp-link support whether they have a beta firmware to support this.