Yea, good luck with that. You need access to the admin panel in order to make new dice, so unless you have very limited challenge ideas, this won't work. And even if you come up with challenges that don't require dice, such as trivia, then people can still Google it, or if it's about the site, they can look around to see where it happened, because you don't have the power to make forum restrictions.
If this could be done, I'd've taken control long ago, considering I'm the only one here that's actually ran a site, and co-ran another one.
But what the hey, I'll humor you. Oh yea, if you do come up with challenges that don't require dice, you will basically automatically win those, considering you're running this, and you're in the game as well. Or, if someone beats you to the punch (ie, pm the answer) you'll just make up how you got the answer first.
Running a site isn't as easy as it looks, and running a SUCCESSFUL ONE (as in, ACTUALLY MAKE DRAMA HAPPEN) is even harder.