Thanks for the reply Sigg Oddra, I had hoped Djinni wouldn't have to be yet another reserve world (with inhabitable worlds at a premium, I doubt there would be many such reserves). The dust in the air is interesting; perhaps there's not enough to taint the atmosphere, but added with the severe axial tilt it creates a meteorological nightmare. The image of a savage, wild world with normal winds attaining high velocity and storm fronts raking the surface is irresistable (based on TNE info the Regency gave up attempts to establish a presence). "Hands off me, sofonts!"
Imagine a "Marooned / Marooned Alone" adventure on Djinni; keep in mind the Octagon Society built their structures to aid stranded travellers. Perhaps this octagon was one of the later-built, shoddy ones but I'm inclined to believe it was older and better-built (being on the Spinward Main). Yet by 1105 it is all but gone.
A propos, your point about Mars is well taken - I was working on the assumption that Mars is size 5; my mistake.
Great forum this, there are some real thinkers out there.