See:
http://doc.cern.ch//archive/electro...xt-2004-109.pdf and
http://doc.cern.ch//archive/electro...xt-2004-115.pdf and
http://doc.cern.ch//archive/electro...xt-2004-116.pdf and
http://doc.cern.ch//archive/electro...xt-2004-121.pdf for a general treatment using one VSL approach and for one possible solution to that question. If one takes some of the implications of QM and modern theory to heart then in essence at the Planck scale every object in this universe moves not only here, but, also through hyperspace itself. Since we generally tend to judge the expance of time for any given event based upon our measurement of C such movement through hyperspace would be for all intents done in zero time in relation to our observed frame of reference. However, its actual time in the frame of reference of hyperspace itself may involve some passage of time that is simply too fast for us to judge or even begin to measure. Sending Macro objects over a larger distance while theoretically possible actually would seem to involve a form of time travel into the future. As such, that type of path does not really beat light in our own frame. In fact, if the value of C is higher in hyperspace it really does not beat light in that frame of reference either.
One key here is playing with the local value of C for two different frames and comparing the results to each other. By usage of a frame with a higher value all one does is manage to travel into the future, not the past. As such, that path becomes little different from say making it somehow possible for a object here to move at C. By SR such an object would experience zero time in its own frame while for the earth hundreds or thousands of years might have passed.
