Dear @Vigardo,
there are still no angular cross sections available in Karamba3D 1.3.3.
For angles shear center and centroid do not coincide and the principal directions of the moments of inertia are inclined with respect sides of the angle.
You could e.g. specify a dummy-I-profile and assign to it the properties of an angle via a ‘Modify Cross Section’-component.
–Clemens