What? Lucid dreaming offers infinite possibilities, so it's completely wrong that all you can do is fly, be in another place or eat whatever you want. I don't know where did you read all that stuff from but you would need to try it youself so you would see how wrong you are. Can't you have dream sex without building a stable relationship with someone? No! Do you want to have dream sex? Just do it, want it and you will have it, that simple. The key is the confidence about your 'power' in that dream world.
Also, you want a million of zombies behind you? Again, want it and you will have it.