Personally, I would flip over a train tunnel home. One that would lead down two different tunnels, to either my shooting range or my dwelling. A radio that actually works would be great. (Why does the Lucky 38 not have a single working radio?) A second exit that would leave the player on the top of the tunnel, as a good sniper spot before heading out would be great to. Plus it would let a player reach opposite ends of the house without more than 1 load screen.
That's just my idea, but maybe someone will make such a clever idea that it might get included at some point.
Oh, I play on xbox, so no nicely modded dream houses for me. :brokencomputer: