Just thought it would be cool if we could actually pick a leader to help us when we go on raids to rival cities. I would like to have an option to bring 1 or 2 with the group. I mean getting For The Horde/Alliance isn't that big of a deal and it would be pretty cool to bring that epic sense of being attacked at any moment (even while at your home) into the game. Server population on some realms really limit how effective 1 side could be. Getting an achievement like that would be impossible if you are on a server that is 20:1.
If you could go to one of the leaders and they asked if you were going to invade a town or something they could give you some item or something that when you reach that town you could summon them and they would assist you.
Maybe there would be some sort of shared gcd between all the npcs (who are faction leaders) so you just couldn't keep getting them over and over. Like a 1 hour gcd before you could get Jaina to raid with you again, but if you already had the token/item that summons her it would last for 30minutes.