pfSense and isolating to single NIC

[TehPirate 0]

So a few questions and bare with me as I'm still learning pfSense:
 

1. Is there a performance or beneficial difference between setting up pfSense completely for AirVPN (following the guide on here) compared to just setting up the OVPN config?
2. Can I isolate the VPN to NIC 2 (LAN) and use my IP on NIC 3 (WiFi router)?
3. If yes on 2, would NIC 3 be able to interact with devices connected to NIC 2 locally?

I need NIC 3 to not have the VPN applied due to PSVue limitations (Smart TVs).

NIC 3 needs to be able to interact with devices on NIC 2 (SSH).

NIC 2 needs the VPN.

 

I'd assume this could be accomplished with NAT Portforwarding and Firewall Rules. But please enlighten me.

[zhang888 1066]

Setup different DHCP subnets for your NICs, then you can pass one class via the VPN gateway and the other via the WAN gateway.

They will be still able to communicate over LAN.