Was reading the link, and the expanded (pun intended) definition. My head started hurting, had some smoke leaking out my right ear, so I had to stop.
Tesseract, I will find a way to get in over my head in a conversation to use that. Finding the right conversation will be very hard, getting in over my head will be easy.
Gods I loved those books, and I haven't thought of them in quite a while until you mentioned this.
To me though, whether or not you can bridge 3D space using a 4D "shortcut" as the tesseract model suggests is not as difficult as finding the right power source to initiate a hyperdimensional jump.
*sigh*
I wish Star Trek were now... I'd sure love to visit the farthest reaches of our own galaxy, and right around the time Voyager ended there were hints that in the future the Federation develops both time and extra-galactic travel.