Smart DNS Proxy does not support split tunneling at the time of writing. Split tunneling allows you to selectively route your traffic through either the VPN or through your default ISP connection.
So you can, for example, send your P2P traffic through the VPN while sending the rest of your traffic out via your ISP connection. Alternatively, you could send everything through the VPN, except your Netflix traffic or anything in between.
Split tunneling is quite convenient and can accommodate pretty much any scenario.
For more information on split tunneling, check out our recommended VPNs for split tunneling.