However, the "free" version does not cripple you. v1.5.9 includes the full Python source code. You can open rigimap.py and modify the proximity threshold or add custom bone name filters for your studio’s proprietary naming convention (e.g., "C_Spine_01"). Yes, with one caveat.
Rigimap v1.5.9 is superior to Blender's default "Automatic Weights" for organic characters (humans, animals, creatures). It handles breast weighting, shoulder pinches, and thigh overlaps better than any free solution. Rigimap v1.5.9 for Blender Free Download
If you are a solo indie dev rigging a cast of 20 NPCs, download this now. If you are a student learning deformation, study its source code. It is, without hyperbole, the most underrated rigging utility in the Blender ecosystem. However, the "free" version does not cripple you