An on-ship firing range where you can test out the various weapons, improve your skills and kill time in the lobby would be a nice simple addition, I think.
And I absolutely support the idea of being able to do text chat in more situations. Should be able to say nice things during loading screens or talk tactics. When you can and cannot chat seems inconsistent and unclear.
Also, toggle to talk mic option. I'm surprised the developers added the rare Push To Mute option but not a Toggle To Talk.