How utterly unrealistic this suggestion is, in context of what this server is trying to achieve, is ridiculous.
Want custom additions to the game? Go play on any non-blizzlike server.
Want to polish something that wasn't polished on Vanilla and got "fixed" in WotLK? Go play on any WotLK server.
The big part of the Vanilla appeal are those unpolished things. As it is generally bad idea to have just one "right", cookie-cutter choice, to have unnecessary obstacles in player's achievements, to have long grinds, to have raids where noone matters that much and it's mostly about just getting the 40 people together, etc etc., it after all is what makes Vanilla being Vanilla.
Start changing it (to be better) step by step and you'll end up in a hybrid between later expansions and Vanilla, getting closer and closer to the expansions. Blizzard did mostly logical steps you know. They're not (contrary to popular belief) stupid.