Consider an absolute point somewhere in one of the universes and consider our light signal with constant speed C which expresses time and distance (same in fact). If you don't know this point, the relativity theory would be exactly the same. If you know this point, you could say, distances are absolute but time is not. Time would be still a relative something, because you can meassure time only from an event, and an absolute point was/is always there. So even with absolute points, you should have time dilations in all directions, because light expresses a relative time to a chosen event. Even if a speed V could be greater than C, time would be going faster (a minus time dilation, like a negative distance), what does it mean, maybe nothing special ... no back to the past/future etc. because a negative time dilation is something like a negative distance ..