Kinematic did the trick, thanks.
How should I interpret kinematic then? If I set Kinematic to 1, it doesn’t move at all, it doesn’t listen to ‘linear velocity’. But then I don’t understand the difference between is static, and is kinematic. Static, I would say, doesn’t move at all, but Kinematic sounds to me like ‘it can be moving’ (but it might not obey the laws of gravity).
On http://wiki.answers.com/Q/What_is_kinematic_in_physics it says “Kinematics is a branch of classical mechanics which describes the motion of objects without consideration of the circumstances leading to the motion.”
But as far as I can tell for now, setting is kinematic to 1 has the same effect as setting is static to 1, that is, making the object completely inert.
So, I managed to get my rigid body to fall, but I don’t fully understand what the pins do yet…