If you check Airframes.org, you can see WWW is a "reserved" code, so I don't think it belongs to Janet. I doubt if they have a code, but for the purpose of flight simulator, I believe JNT is the accepted one.
Fake Runways???
I have no idea what your talking about here.
In order to enable non-parallel runways, such as at KLAS, one has to make a "star", comprised of the real runways and fake runways, which are inserted every 7.9 degrees, to fool FS into thinking the real runways are parallel. FS considers two or more runways parallel if there is no more than a 7.9 degree heading difference. We used to believe the fake runways had to be placed in the AI Visual Zone (108NM?!) for the star to work, but later it turned out they could be located anywhere. By placing them far away, you prevent ATC from clearing aircraft to land on them. It would do that, even though the runways were only 10x10ft and closed to all traffic. (Has to do with the heading of the runway and aircraft.)
BTW, I use a 23m radius for BBJ's, simply because they are 737's. See attached my latest Afcad. It adds a bunch more GA (including Las Vegas Sands spots), reincorporates the aprons and is also back to 1ft links around hold short nodes... Pretty close to done.