Treaties threads are good ideas, I think I'll spin the Debates thread into its own sub forum and you guys can go wild.
One treaty you might want to think of when the issue comes up is what to do with active sensors on Earth. My previous groups didn't particularly like the idea of other groups spying on them and ended up enforcing a ban on Earth and in orbit.
I know active sensors don't actually tell a ton about your stuff in game, but for RP purposes they will let you get advance warning of troop movements and such, as well as more detail about ships than just speed and emissions, you won't get any specific tech knowledge, but it will give you some clues as to the ships design philosophy.