Your first one technically already exists in CM - walk in the spotlights and you're blasted by the airship floating above, and extra mobs are dispatched. Your second one sounds just like an excuse of e-peen stroking. And the floodgates would be opened from stupid people 'demanding' SE give such powers outside such a hypothetical instance. Besides, your character has the Echo, they're already wielding God-like powers
after all, in the final battle in the Praetorium, Lahebreha actually states outright the player has powers "beyond that of a mortal."
It's not necessary.
Your final idea though sounds like what SE is already planning with the Frontlines PvP system, and I admit, it is an interesting concept. That's something I felt Campaign in FFXI never had - that all the battlements and artillery at Campaign forts was just there for show.