Obviously it was designed with Federation ships in mind with the blue energy you get from your nacelles (I never did figure out how you transfer power from your warp nacelles into your fusion reactor impulse engines, but that's an argument for another day).
But given that the KDF and Romulans have various powers representing their factions, I think we're overdue for Emergency Power to Engines reflecting the nacelle energy color of the KDF and Romulans.
Red-Orange for KDF characters. Dark green for Romulan characters. I'm not a fan of seeing blue energy come from my KDF ship's nacelles, or blue energy coming from my Romulan warbird's nacelles.