Steve,
Remember that all planetary bodies with satellites will have lagrange points, I am sure you know this already--I expect I am insulting your intelligence, so I apologize ahead of time. The interesting thing is what will happen to the Lagrange points in a Binary, Trinary, and Quatenary systems?
As you well know the Earth-Moon system lagrange points are converted to a 3-D loci where objects will remain trapped without station keeping drives due to the influence of the sun. So if the Earth-Moon-Sun lagrange points are stable, then I would expect to see stable points in the Jovian Trojan points for other Jovian class worlds in other star systems.
This complicates the military geography of the Solar System, given the ability to position asteroid fortresses at trojan points or Lagrange zones. Any Asteroid fortress at a lagrange loci would be at the top of the local gravity well compared to ships maneuvering in the earth-lunar system.
Kevin