Well... here some suggestion, that have my good friend and brother, flying with me as main engineer: some kind of service panel, near capn, that should replace UI icons for subsystems. With, you know, some lights, that will indicate state of things on ship. I think it will be interesting and useful, like, when on Junker and you lost one of our secondary engines, you don't know which one, especially in heated battle.
And, you know, with all this minimalistic UI, it will be cool to take all this icons on ship-panel, like wheel and etc.