Request: Symmetry planes per selected material

When I turn on paint symmetry, the plane is based on the center of the total geometry of my project.

Suppose that I have several materials in my project. It is frequently the case that I want to symmetrize around a specific subset of geometry containing a single material. To do this in today's version od Sunstancec Painter, I need to turn on symmetry, set the axis, and then drag the offset sliders to (very) roughly get the plane to the center of the intended piece of subset geometry.

I would like for a checkbox option in the symmetry settings to choose to center the plane on the active material's geometry, so that I can easily get in the middle without dragging sliders and eyeballing it.