What I did with my rotteweiler was whenever she "love" bit me, I would hold her snout closed...
I worked at the SPCA, and their advice for biters was to pinch their ears... that's supposedly what the mommies do when the pups are doing something unacceptable.
With the bathroom idea, I don't think it's a good idea. Room to run=room to pee
With the crate, they are supposed to be small enough only for them to stand, and lay down. That way, they won't pee where they sleep.