You can displace faster than light. A wormhole has no length, if you pass through it you come out instantly with the same speed, momentum etc. as when you went in. If the two hols where light-years apart you could travel faster than light although your speed wouldn't violate the speed of light. Its a cheat but it works. Also warp drives and superluminal highways are theoretically possible.PArallel planes and dimensions are rubbish though. A Dimension is simply a quantity or characteristic that an object must have but that doesn't affect the other dimesnions. Hence somethings height doesn't affect its width and the position in time doesn't affect the position in space. At least not mathematically and not necessarily, although you do grow as you get oilder it is not a mathematical formula, people are different heights, and no matter how long you look at an atom irt won't get bigger as it gets older. (also people don't count as they are made of atoms, still it illustrates the point well)