Ok, so I watched the live stream again and and it's does clearly state, no matter how many CMDRs there are on your ship, you only get one extra pip. It is stated at 27 mins and 18 seconds or there abouts.
Things have changes since I ran two accounts on the same PC, going back over a year I would guess.
You used to be able to run the launcher and enter the game, then change accounts in the launcher and run the second account from there. This has changed and the method no longer works. You can run two different versions of the game, such the base game without horizons and then full horizons, but you can't run say two full horizons.
There are programs available like has been mentioned, that can create virtual PCs on the same computer. I have used one in the past, but not tested to see it will let you run two or more sessions of Elite.. Sandbox has worked well with other games.
We only have one beta account in the house, so I have no way of testing this out.
I'll also add, pips only distribute power, they do not give you extra power. So all you are doing is draining your distributor quicker. There is a trade off.
I'll ask a friend tomorrow who may or may not give me access to his account, see if we can get some answers . I'll let you know one way or the other.
Be sure though, this is beta and you've got to ask yourself is one extra pip worth all the hassle?