So I've tested this as well, and it breaks the flow of the game (regardless of if it actually helps you jump farther). It's unwieldy button placement, and to say its button placement is fantastic with such a huge flaw is just wrong.
If it has no benefit in the gameplay then the button placement doesn't matter. You run then press jump, there is no need to hold onto the run. Its no different than any other quick succession of button press.