Are single facility planets useful for anything other than 'bookmarks' (waypoints?)

[Quikngruvn]

Research and build troops. Go invade someone who breathes the atmosphere of the tiny planet. Transport conquered population to the outpost. Work their alien butts off.

Another option: build a space yard. Build a base space yard. Scrap the planetary space yard and build something in its place. Now you can build ships at that planet (albeit more slowly) with something else in the planet's facility slot.

Usually I just put a space yard on tiny unbreathables, just so the planet can build ships in time of need. (Hey, if you've got the resources to support all those space yards, might as well put then to good use!)

Quikngruvn