Spline rotation, cant adjust roll. Using Camera Rig Rail.

I am trying to adjust the rotation of a spline.
More specific, a “Camera Rig Rail”.
I really need it in specific locations with specific rotations for the camera to take nice shots.

However when taking a point in this spline, and adjusting its rotation, I seem to be unable to adjust its roll.
Even if I take the last point of the spline, it wont let me adjust roll.

So how do I get my “Camera Rig Rail” in the right orientation?