Wakis allows to simulate materials with anisotropic permittivity, permeability and conductivity that do not depend on frequency. To extend the applicability range of Wakis, while keeping the computational resources reasonable, 2 major implementations are needed:

• Subpixel smoothing (as done in MEEP) for partially-filled computational cells: to better represent materials at CAD solid edges--especially at curved edges.
• Surface impedance boundary condition (SIBC) for highly conductive materials: to avoid meshing with the skin depth accuracy while still reproducing the lossy behaviour.

MEEP reference: https://meep.readthedocs.io/en/latest/Subpixel_Smoothing/