Ok, i'm not sure if you can do this already with some sort of trick, or if there's soem kidn of expansion mod or soemting for this, heck, there might not even be a poitn to this, but i was thinking about a power seperation cable.
Ok, so let's say you have a bunch of areas that need power, including a backup power supply. You don't want all your power to go to one area, right? Well, with this cable you could right click on it with a wrench to open a menu, and you can select how much power goes to each direction. Like, 35% going to your machines, 40% going to your backup energy storage, etc. It's almost liek the diamond pipe from buildcraft, but with power seperation.
Just throwing this idea out there. Now again, i'm not sure if you can already do this with regular cables, but it'd be nice to have a single cable to do this.