How can you create a realistic entity with your mind who has more knowledge about something than your own mind does?
That is a very good point and that may, in fact, be the impossible thing. But I'm thinking you could at least make whatever you're up against a challenge at least. Or with the same skills as YOU Then, as you progress and learn new things, so might your opponent...

And I wouldn't call it anti-dream control; it's still dream control, you're just keeping waking-life possibilities and laws constant in your world. Or rather, willing them constant. Kind of like how you wish a video-game was more realistic for the sake of keeping things tough and extremely hard. Instead of being able to get shot a thousand times and still be okay, you want to only be able to take a few in certain select areas of your body to test your skills a bit more.

I myself personally have just gotten back into lucid dreaming and haven't become lucid yet. Granted it has only been about a week-ish, so I still may have a ways to go before I can create an environment with enough stability to test my theory. But I encourage you guys to try it! Hell, it really isn't MY anything, I just had some thoughts on it