I have an issue with controllers in "locked" mode. While they are being moved, they seem to behave as if they were in normal mode, that is, the character mesh does not follow the controller closely; it is not locked. Then, when the control is released, it goes back to locked mode, making the character instantly move by a large displacement. This makes it really hard to work with the locked controllers, because you can't slightly move them without producing a large displacement of the mesh (the mesh goes to the "unlocked" state, and back to the "locked" one). Besides, you can't visualize the difference the displaced controller will produce while moving the controller, as is normal in the other modes. This seems like a bug, but I have never seen it addressed.