Since we're throwing out suggestions for hyjal, fun item / quest item vendor (thought I'd see this in pf but nope), chill zone , timeout zone, mats vendor, arena boss, zerk/speed/health buff at arena, enable global chat cause typing /o is quicker. Maybe give up .morph? Idk that one is kind of a stretch but it'll add to the fun Rp / pvp / pve wise.
Oh and fill up the auction house with goodies, gear, weapons, items etc. Also, noggenfogger elixir.