True, though any of the four Engine abilities gives you the same boost to ship speed when fully upgraded. And while it is right that Barrel Roll allows quick travelling by itself, I consider it a cheese mechanics (like Gunship's Ion tap) and would not be surprised to see it nerfed/adjusted in the future. The Engine abilities were indended as missile lock breakers, not as means for faster travel.
The funny thing is that cheese mechanics often make a deeper, more fun game! People using abilities etc in unorthodox ways that were possibly not even intended makes for a less streamlined experience, and one where player creativity is rewarded. Of course this is not always the case and some things do end up needing to be fixed but you get my point.