I'm not sure about the physics engine but perhaps you could make a map with a black hole(s) incorpoated into it. Maybe if two fleets are being sucked into a black hole and fighting each other at the same time. Maybe you must defend your engines while disabling the other fleets. This (if they are destuctable from the inside) could really increase the chance of teams invading the other team's ships. Perhaps you could make the black hole a skin and make it water/ground, that way you can't fly through it or land on it. Here are some worlds/space areas that you can use for maps:

Hydian Way

The Hydian Way is a route that begins at the Corporate Sector on one side of the galaxy and continues through the core to the other side, past Eriadu. It is the only route that passes through the entire galaxy. It was blazed 3,000 BBY by Freia Kallea, and helped open up much of the galaxy beyond the region known as The Slice, fundamentally altering the scale of galactic civilization.

Dathomir(next to Hydian Way)

After the Jedi Purge, the fabled village of Aurilia was believed to be located somewhere on Dathomir, and it was rumored that Force-sensitive individuals, perhaps even Jedi, lived here in exile during the reign of the Galactic Empire. However, the Empire soon sent a fleet into Quelli Sector to wrest territory from the Drackmarians, and Dathomir was claimed for the Empire. Around 2 BBY Emperor Palpatine reestablished a penal colony for important political prisoners, while the Imperial garrison hunted the remaining Kwi to near-extinction. Shortly after the Imperials arrived, an exile from the Singing Mountain Clan named Gethzerion began to form a new clan of Nightsisters with Imperial encouragement, but when Palpatine realized the threat they posed in the Force, he quickly placed the planet under interdict. Two Star Destroyers were stationed in the system to prevent further contact with the surface, and Gethzerion and her clan then enslaved the stranded Imperial garrison and their prisoners.

The Maw

The Maw was an unstable and mostly unnavigable cluster of black holes located near the planet Kessel. It was created by an unknown people, 1 million BBY. The stability of the cluster itself was something of a mystery, with some believing that an advanced civilization might have constructed it, rather than it merging together like a normal cluster would.

Hope that this can work.