Yeah, two FTL modes are not in the original but, surprising myself, I wasn't bothered.
Not many women in the original either, no people of color, no continuing characters, and hardly any visible action. It was always obvious that this was going to have to be profoundly different from the source.
Still, not having seen it yet, I have to wonder what the narrative purpose is for adding a "slow" FTL system alongside instantaneous hyperdrive.