Only problem I have is I ride on the road 5 or 6 times a week but go mounting biking 2 or 3 times a month. Off road, using only front brake is a good way to wash out your front wheel and get into a lot of trouble (while giving your buddies a good laugh).
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I'm assuming your riding a full suspension?
I also come from mountain biking and with my hard tail, all the real braking HAS to come from the front... as you are travelling over rutted ground the rear is skipping over the bumps and simply has little/no traction, so the rear brake is simply to stabilise the situation. The front does all the work.. a large volume front tyre and suspension maintains your contact patch to the dirt and you just learn to lean on it and the back will simply follow!
I have found that my road bike is more capable coping with this than I could have imagined, and as long as you don't go silly on loose surfaces (please brake before the curves) it is often our imagination that limits all our abilities
