You wouldn’t be able to send more torque to the rear wheels (relative to the front) with an open centre diff as explained by Mirek, the only difference opened or locked front diff will make is to provide “the least common denominator” for the whole transmission system, i.e. the path of least resistance or in other words the max torque that can be transmitted through the system.
Looking at it from another angle (which might be what you meant), the combination of open centre diff, open front diff and some state of locking on the rear diff is likely to make the car more stable, i.e. give degree of understeer in general. Whether such comination will make the driver think or feel he has something akin to a rear wheel drive car, don’t really know, might be possible.