Is there a Scenario...

[BFG]

...that pits a single human faction (probably someone mundane like the UN) against both Progenitor factions, and no one else?  Such a scenario might be fun to play.  I tried creating one but need to gain experience with the Scenario Editor...starting with figuring out if it's possible to have random start locations on Scenarios (I'm guessing not).

[Buster's Uncle]

Check out the Altera Centauri subforum of Command Nexus - there's five pages worth of scenarios, one to a thread.  I don't remember specifically what you're looking for, but it's been a while and it was a lot of posting in a short time when I was putting them up...

[BFG]

Awesome, thanks!  I really need to spend more time on that subforum.

[Buster's Uncle]

That there's a RESOURCE.