Blink skill moves in the wrong direction when using wasd controls

If used while walking blink seems to completely ignore your mouse cursor when choosing its direction and travel in the direction you are walking, however it uses mouse cursor while not moving and while in mouse movement.

As an aside, the skill would feel much better if it had a minimum and maximum travel distance rather than just a fixed distance, especially one that changes with levels.

Edit: Occurred to me this might actually be the intended behaviour, in which case some kind of setting would be greatly appreciated.