I must confess that I have an unhealthy fascination with the FTL drive of Warhammer 40K, where the hyper-sub-alterspace that allows FTL is something called the Immaterium, a kind of hellish dimension inhabited by the Gods of Chaos, where Mind and Matter are the same thing and every ship need psychics on board or the crew would go raving mad. I mean, dude. I'll rather stay home and play water polo.Another interesting one, and I suppose it goes into the category of using another dimension, is the "black hole" drive in Event Horizon.
Just your ship comes out demon posessed, so I'd recommend against.
As a fan of the W40K universe, I agree, there is something cool about creating such dangers in it

For a demonstration, watch Event Horizon to get an idea what happens to a ship in the 40K universe when it's Gellar Field (the device that generates a bubble of 'reality' around the ship to survive the warp) collapses. Now crank it up to 11.
