Symmetry operations with SOC
Currently, in case of SOC, Fleur restricts the number of symmetry operations to those that leave the spin quantization axis invariant. This is indeed needed for systems with spin polarization (non-collinear magnetism). However, it is an unnecessary restriction for systems with SOC but without spin polarization.
Why is this feature needed?
Running with more symmetries is more stable, certainly for geometry optimizations, and faster (less k points). Spex calculations benefit from higher symmetries, in particular.
I implemented that already in the old Fleur code. It should be straightforward to implement it in the new code. I guess one would just have to modify the routine "soc_sym" in the new version. One possibility would be to restrict the symmetry operations only for noco calculations (not generally for SOC calculations), or, if you want to keep the old behavior, one could check for gw>0.
\label Feature Request