There have got to be ground based missiles, and maybe some beam weapons, useful for a slash at troop transports & stuff drifting too close
(Range 3 or so?)
Nothing too serious, but they should be able to hold control of a planet despite some "splash damage" from an orbital battle. Sort of an air-raid bunker for small pop colonies.
RE: black hole stars: I'll have to go with Val on that. The distortions would look cool, but they would probably not mesh with the system-wide image, and end up looking dumb
If you want an accurate B5 game, you'll have to go with a scenario.
For lots of good random games, let the wanderers & pirates have their homeworld for initial production.
When it gets destroyed (as it will inevitably be, since they can't build colonies) then they will move into the true Nomadic/Pirate lifestyle.
The Drahk will be unrealistic except in a scenario, so they should probably be set up like a neutral for random games.
If you find and befriend or enslave them, then they could go and fight on your side, or whatever.