Like I said before with new zones, changes to zones must be copied over to the actual game. Unless updating the zone is going to prevent a crash, it's highly unlikely they'll port in fifteen room for a RP event. Now, actually -editing- the rooms on main, they have done to an extent, but no mortal can do it. Simple reason: We mortals can't be trusted with OLC skills on main... I'm sure I could be, but even I agree that no mortal should -ever- have OLC commands, (except maybe hedit, because we bloody need -someone- to update these out of date help files), on the main port.
As for a raid - That's what legendary mobs are for. While I myself have an idea for an event like what you wish, something on the scale I'm planning, I had to throw an outline to Chalgyr... cause... well... it's big... but most of it would happen in story format, with people being able to throw their ten cents in as it develops... but yeah. This -isn't- WoW >P.
Again, if you have a good idea, and take the time and patience to plan it out and see it through, then i'm sure the imms will indeed -back- you on it. If all you have is, "X, Y, Z, and I wanna RP something where we have to kill something really strong," then odds are... well, if it were Odin, he'd transfer you to the Fallen Kalchi King. >P