A bit nitpicky but from the same game:

This was from a game where I integrated Phidi as Gremak.

Putting a maneuvering engine on any orbital (like a shipyard or fleet base) allows it to retreat from combat, which puts it out of orbit and retreats it like any other ship. This then allows the orbital to move around between systems like normal ships.

Also, the 'Fast Tactical Animations' setting ...

I think you can retreat with a base if it has maneuvering engines on it, which puts it out of orbit.

What about attaching a maneuvering engine to a fleet base and using it as a great boarding ship?