No, if I wanted that, I would just ask for an increased movement speed everywhere all the time, not one that really convoluted and depends on mob availability. Also, you can start running away without hitting disengage. Just swap into movement and you'll automatically be unlocked from the target. At this point, just start running, don't bother with disengaging until the game does so automatically as you get 30 yalms away.
In either case, we did actually get movement speed increase just recently, one that is active everywhere, all the time.