Case:2) Would I be correct in theorizing that you could join two ME networks together using P2P tunnels connected to each other (for example: cable - tunnel - tunnel - cable)? If so, I could imagine that if there was a central ME network, you could connect multiple "subnets" that handle specific purposes.
You have a large ME network throughout your base.
You have a separate subnetwork handling items you do not want mixed with the main network(I have one handling IC2 uranium fuel refinement for example, don't want radioactive items in the main network ).
Lets say that you now have two places far from each other in your base that you want to use this subnetwork, but you don't want to run a subnetwork cable ALL the way there. By using the P2P tunnel you can tunnel the subnetwork through the main ME network that already have cables running throughout all of your base.