That's great. I love the sound of this "technobabble". As an old fan of technobabble from the days of star trek, I consider myself a connoisseur.
Technically in this case, but that's actually the in a nutshell description of an Einstein-Rosen bridge.
The variables I'm talking about can be mapped on this Penrose diagram, upon entering a blackhole the space and time values of the diagram FLIP, so that space is on the Y axis and time is on the X axis, which means inside of a black hole, moving to the singularity is a spatial inevitability, every movement no matter what direction moves you toward the singularity, while interestingly you have complete freedom of movement in time. You can move backward through time to the beginning of the blackhole or move forward to it's death, however you cannot leave nor transmit info out. So you are master of time but only inside the event horizon.
Now add the proposed Einstien-Rosen bridge to the equation and what you have IS a method of escape by moving toward the singularity, and erupting from the singularity on the otherside, the hypothetical whitehole, with still inverted values, but reversed flow, so every movement pushes you inexcerably OUTward toward the horizon, where it spits you out into normal space.
Now supposedly according to the lore, FSDs create essentially wormholes through higher dimensional space. and from my observations, when you jump your jumping INTO a black void, but come out through a bright flash, which would make sense if it was something like this.
So I surmise that if this is the case, such transitions are one way only, which is probably why you cant redirect or navigate freely during a jump, you're literally being pulled through a tunnel of your own creation that has one and only one direction toward it's endpoint (that you also determined.)