Yeah this could work. In a real aircraft if you fly out of balance then the yawing moment will also create a rolling moment which you have to correct with aileron. So if you wanted to fly out of balance you would have to add some roll to compensate and fly straight. This is commonly called "crabing" and is a technique for crosswind landing. The reason this occurs is because when you fly out of balance you are presenting more wing at a flatter angle to the relative air flow which will in turn create more lift from one wing and less from the other, rolling the aircraft.
So yeah it would work, because in a real aircraft flying out of rudder trim will cause you to roll. DCS Black Shark gives you a good indication of balance just by the looking at the terrain and how the aircraft is tracking, however you need to have a good view of the ground to do this, so not so good for high level.