Yo dawg, I heard you like transporting the channels for P2P tunnels via P2P tunnels.
Too bad this isn't working, I thought I could run 32768 channels through one dense cable
But I can use a subnetwork with the sole purpose of transmitting channels from the main network, only connected through quartz fibers.
What? You can't run P2P tunnel channels through more P2P tunnels? That surprises me.
I like to plug my P2P tunnels into my main controller, so that the cable coming out of the tunnel and the cable between paired tunnels are on the same network. It's mainly for convenience- if I need a single channel somewhere (or as part of a build requiring nine or thirty-three channels), I don't need another P2P tunnel to connect it to the rest of the network. I ran into that problem in the auto-potion-crafter that I posted about somewhere a while back.
Subnetworks work too, though. They save some faces on your controller, and don't necessarily even require controllers of their own. You could use a separate ad hoc network for each face of the controller in your main network (which could make dense cable entirely unnecessary), or you could make a single separate network with its own controller to manage all the channels in your main network.
Also, I'm not sure if I reported this here already, but the cable supports, when placed horizontally, can be climbed like ladders. They don't negate fall damage, though (at least in the version I tested), only delay it until you touch the ground (or the top of the ladder, if you fell off and climbed back up), so I wouldn't use them in place of actual ladders. Very handy for climbing over your own ME constructions if you build aboveground, though.
Another thing: If you place them on alternating sides of a vertical cable, then remove the cable with a wrench, you can still climb up the supports if you walk into the middle of the space where the cable used to be, but you will go through if you move too far to the side. I'm not sure if anyone will actually find this useful outside of an ugly-looking 2x2 shaft, but I found it interesting.