I could be wrong, as I tend to get stories mixed up from time to time, but I was pretty sure that one of the classes actually has a story mission or two ON the station. I think it was Operative...or maybe it was Smuggler. Anyway, I just remember thinking, "OOooooooh....THAT'S why this station is here!"
I rotate through my characters fairly often and I have 1 of each class/2 of each role....so...I do get a bit confused on specifics from time to time.
i think there are missions that are on orbital stations but they aren't on any of the ones that are around a mission planet they are either companion missions, or they are between planet missions. The stations look almost the same as the ones around destination planets but i don't think there are any actual missions on the orbital stations around destination planets