Breakfast Topic: If you could design one new feature...

Most of us reading this aren't game designers. (Hi, Ember! She is!) So it can be fun for us non-game designers to think about features we'd add if we were helping to design World of Warcraft. For example, I've always wanted to see WoW allowing us to permanently claim a dungeon or raid we'd successfully cleared as a kind of housing instance. So, as one example, if your raid killed Garrosh Hellscream in Siege of Orgrimmar, you could basically set up shop there and have your own permanently cleared version of the raid with your own castellan and other features.

Another idea I've always cherish was the idea of cross-faction raiding. I know it'll never happen, but I'd like it to.

So, what are your ideas? What feature have you always wanted to see in WoW?