I still stand by my best opinion that FTL is no problem - it's observing FTL that is the problem. That is why one experiment protocol which tests the results of FTL will show that FTL has indeed happened -- whereas, when the experimental protocol is designed to actually observe FTL, it cannot happen. JDLaw's New laws of Lightspeed. (note: these laws have not had peer review -- feel free to pooh pooh). It's kind of based on light cone theory and the Planck limitations (length and time).
Inertial Einstein equation
Lorentz Transform (compare)
JDLaws New Laws of Light-speed
1. The observed speed of light in any reference frame is approximately 299,792,458 meters per second.
2. No mass, energy, or quantum particle can be observed directly by another mass energy or quantum particle that has a greater relative difference in velocity than 299,792,458 meters per second.
3. Where two masses, energies, or quantum particles are moving, spinning, or vibrating with velocities separated by greater than 299,792,458 meters per second relative to each other they must exist in a different quantum realities. However, a third mass, energy or quantum particle whose relative velocity is between the two may observe them both.
4. This reality is finite, but the number of realities is infinite.
5. There is another reference frame in some reality that exists somewhere or sometime where this reference frame, you are in right now, is moving at the speed of light relative to that other reference frame.