I don't have a crockpot, so I can't answer your question. However, I thought I'd post an alternative way to cook brown rice that I have tried and it works really well. No mush
This is from Cook's Illustrated magazine:
FOOLPROOF OVEN-BAKED BROWN RICE
1-1/2 cups long-, medium- or short-grain brown rice
2-1/3 cups water
2 teaspoons butter or vegetable oil
1/2 teaspoon salt
Preheat the oven to 375 F and move a rack to the middle position. Spread the rice into an 8-inch square, glass baking dish. In a covered saucepan on the stove, bring the water and butter or oil to a boil over high heat. Once it begins to boil, stir in the salt and pour over the rice. Cover the baking dish tightly with a double layer of foil. Bake for one hour, until tender. Remove from the oven and uncover. Fluff the rice with a fork, cover with a clean kitchen towel; let rice stand 5 minutes. Uncover for another 5 minutes, then serve immediately. Serves 4 to 6.
It does make a lot, but you can put it in baggies and freeze it.