Is there a way to vertex-paint-brush vertices that are behind the faces? Kind of like x-ray select, but x-ray paint? There is an option "Front Faces Only", but even if it's off, it doesn't seem to do this (actually I can still paint on backfaces even if this option is on, but not on vertices that are behind faces). Also, enabling x-ray view-through (or wireframe) doesn't seem to do anything to the brush tool.
I would really like this option because I use vertex color in my game as a sort of a "weight" for a shader, so being able to paint a smooth brush over some layered pieces is a must
(working in 2.8)