Pose Shape Keys, developed by Mets, addresses a common rigging headache: corrective shape keys that break when you adjust vertex weights or change bone constraints after sculpting. The add-on stores your final sculpted shapes separately and re-applies them on top of a modified base mesh, provided the topology hasn't changed.
Beyond preserving shapes through weight changes, it opens up several workflows. You can sculpt facial expressions first, set up Actions that move some deform bones into a similar pose, then blend into the pose you sculpted, combining sculpted precision with individual bone control. Symmetry is supported through per-side mask vertex groups, letting you author and propagate both sides of your shape keys at once. You can also author multiple shape keys at once, such as a Fist shape that breaks up into individual finger joint shape keys, with an operator to normalize the masks.
Automatic driver set-up handles simple cases and is often faster than starting from scratch. Version 1.0.0 refined that set-up with options to filter bones by selection and by side. Pose Shape Keys runs on Blender 4.2 LTS and newer.