There are so many varieties of ways CS can cut up trips, you are really shooting yourself in the foot if you get too specific. Case in point, out of base pilot puts "minimum 4 hours to report" as an option. Then there's a GS with a DH to his home town that leaves in 40 minutes, layover, and fly a leg to ATL. The commuter just lost a 2 day GS where he wouldn't have even had to have lifted a finger until day 2. Up to you, but I always have a blanket in-base GS on file.