instead of always having to square-up against your enemies in the cold dead of space, starting a fight against another fleet while either is in orbit of a planetary-system should initiate combat in the upper strata of that planet, with a panoramic view of the topography below. imagine defending a Hegemony orbital-station above a lush jungle planet from approaching raiders, with a birds-eye view of the jungle trees & bright blue river & ocean-bodies underneath oneself as you wage battle. or perhaps you want to knock-out a Tri-Tachyon colony, and duke it out against the defenders of said colony, with a lovely view of the gridwork of city lights on the planet's surface.
i think a feature like this would add a lot more
atmosphere to the game