After careful reflection I have determined what the next expansion must be. Really, it's obvious.
Joining Unity, the newly-added Unreal engine allows for a First-Person Starship experience like no other game. Fly a Mk 1 Fighter through huge enemy fleets of 10,000+! Watch as all your companion fighters are picked off one by one by Core Fighters. Marvel as the 3D head tracking - using only a standard webcam - lets you see how far behind you left the rest of your fleet as you barrel in on that Ion Cannon Mk V.
But don't worry - if your fighter gets destroyed - and it will - your vision will go blindingly white before fading to black while your neural circuits reboot back into your ordinary body at home base. Nothing bad could happen during those 10 seconds. Really. Cause, by then, your Siege Starship will be ready to command, first person, and its Captain was just wired with remote telepresence wetware...
Cheers!