This quality for a station means that it will only appear once in a game. In addition, the regular level and rarity values can apply, as well as the rest of the modifiers. This is a great feature!
For my test I built an extension and thought up some names for some more noteworthy and notorious Outlaws, and a couple of smaller Pirate organizations.
I copied over the outlaw camp station code, then buffed it up a little differently for each of the ten names for unique outlaws I came up with. I did the same for a pirate type station for four unique pirates.
This was great! Now I have 14 unique little 'slightly tougher' outlaw and pirate uniques that should only appear once in the game, to spice things up a tad.
I play tested a few runs, and what do ya know- unique, easy to create stations. The outlaws were tougher, but not too tough, and the unique little "so and so's gang" made discovering them kind of fun.
Now I wonder- why not make a bounty type item (like a frozen bad guy boss in a cryotank) that could be only found in a unique station- each unique station gets a unique 'boss' treasure, and then have a CW Justice department or Bounty Hunter's Guild to take the bounty item and score some rewards- sound fun?
[Yes, this would pour more money into the economy, but let's pretend the economy was already fixed enough to make bounty hunting viable]
Anyhow, how about some ideas for unique enemies? This could be an unlimited expansion in many respects!
I will put together a big group of uniques to release as an extension that will work with the recommended mod format and stand alone- in a bit.

Here's the little prototype I tested- plop it into any extension folder to check out the unique outlaws and pirates I added: Unique Enemy Sample