In what ways would an heir of space be able to passively change space? Would they be able move faster than others because they can shrink the space between them and their goal?

Possibly, but think also of Changing Through Space, as in influencing a Change in Someone or Themselves by their influence on Space, perhaps like getting taller or shorter because they manipulate Gravity and over time it affects their growth in general? Just throwing ideas, it’s a bit hard to tell actually.