SoftBody Manipulation (movement and torque)

[XMight]

For the case of the rigid bodies I use:

Hooke's lax and damping effect to move objects with my 3D cursor, and this line to apply the force:

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body->applyCentralForce(btVector3(forceOnBody[0], forceOnBody[1], forceOnBody[2]));

Hooke's law + torsion effect to apply rotation with my 3D cursor, and this line to apply the force:

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body->applyTorque(btVector3(bodyRotation.getX(), bodyRotation.getY(), bodyRotation.getZ()));

In the case of soft bodies, I can't do the same thing. Instead, to move the whole soft body, I use:

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softBody->addForce(btVector3(forceOnBody[0], forceOnBody[1], forceOnBody[2]));
softBody->applyForces();

For the velocity in the damping formula, I simply use the velocity of the first node of the first face (not too smart and correct, but it works at least), since I can't get the velocity of the whole body, even if I can set it (dunno why this one is present, and another not).

Anyway, I haven't found a workaround for the torque on the soft bodies.
I imagine that not many need this thing, and not many have the experience with this, maybe no one, but anyway, can someone suggest how can I apply the torque on the whole softBody?

P.S. I tried softBody->rotate(btQuaternion(1.0, 0.0, 0.0, 1.0)) and with other values, and no success (Unhandled exception is caused by the method on my softBody).