Currently conduct regarding Zones of Influence is that outside of it free movement is allowed, combat is only in self defense. So basically you can trade Sirius-wide, RP Sirius-wide, even have your pew Sirius-wide as long as you make sure you don't shoot first out of your ZoI, rather provoke others to initiate combat.
So if anything, what do ZoIs restrict? Do they mean anything at all? What is the point of having them?
Edit: Managed to enlighten myself shortly after posting this thread: you can't pirate outside of your ZoI... which is not much anyways, since piracy is kinda dead lately, sooo... anything else?