Unless the admin team is ignoring server rules or giving TAZ special treatement you're very wrong regarding Baffin (or rules have changed).
Mal had the same idea in his head and he got warned by the admin team regarding said idea. TAZ cannot prevent Zoner ID'd ships from using Pueblo (or any station in Baffin for that matter).
While I support TAZ using a PoB to bar access to Pueblo to non Zoners, using it to kill other Zoners seems very much like a rule violation to me (though there aren't any hard set rules on PoBs that I know of).
Again, I'd point out that the admin team warned Mal about shooting down other Zoners who were docking to Pueblo in the past and I don't see a difference in a TAZ ship shooting them down and a TAZ PoB doing it. Same people after the same ends.
Edit: Regarding Asbestos' suggestion. I'm against it. Bases baring access to certain systems and such is fully within role play. How does using a base in a role play fashion disrupt game play? I'm looking at Henderson's examples right now. He wants to be able to stroll through O74 as a Nomad and stroll into Bretonia as a Corsair. Zoner bases in 74 shoot at Nomads on sight. Bretonian lawful bases shoot at Corsairs on sight. How is a player base doing the same disrupting gameplay? Cause the player's behind the base were smart enough to place them at a choke point? No, those of you whining for the removal of this ability based on examples like Henderson's are disruptive to game play.
That said, I do think some people disrupt game play with that aggressive setting. They are a minority and shouldn't be used to justify removing an ability. The admins should be dealing with them on a case by case scenario.