^Wow, that's fascinating. When you say your effective superluminal (ESL) velocity is the product of realspace velocity and the warp velocity... would you be able to modify the warp velocity directly and only use realspace velocity to set your direction of movement, or would you have a fixed warp velocity component and need to accelerate in real space beforehand to set your warp speed? I.e. if you wanted to go twice as fast at warp, would you need to accelerate to twice the Newtonian velocity before engaging your warp field, or could you just thrust a little in the desired direction and then activate a warp field that's twice as strong?
And this does suggest that "Faster than light, no left or right" from the much-hated Voyager
: "Fury" is actually true -- that you'd have to drop out of warp to change direction.